Stomach Cancer in Dogs: Vet-Verified Natural Options & Early Signs

Stomach cancer in dogs is rare, representing less than 1% of cancers in dogs. However, this type of cancer may be more prevalent because the clinical signs are nonspecific and are similar to other less severe gastric diseases. Clinical signs often include nausea and vomiting (sometimes bloody), decreased appetite, and weight loss. The diagnosis of gastric cancer in dogs is often made when the disease is in the later stages. Therefore, early detection is important for more successful treatment, a better prognosis, and an increased survival rate.

In this article, you will learn what stomach cancer is, how to detect stomach cancer in dogs, what the clinical signs are, what the diagnosis and treatment are, what natural options you have, and much more.

What Is Stomach Cancer In Dogs?

Stomach cancer in dogs involves the uncontrolled growth of cells that make up the stomach. Tumors can develop from the cells in the stomach lining or from the muscularis (a layer of smooth muscle) that surrounds the stomach.

Stomach cancer can be benign (noncancerous) or malignant (cancerous). Malignant tumors are invasive and prone to spreading to other parts of the body (metastasizing).

There are several types of malignant stomach tumors in dogs, including:

• Adenocarcinoma – the most common type of stomach cancer in dogs
  
• Lymphoma
  
• Mast cell tumor ( Maltese and other toy breeds are more prone)
  
• Leiomyosarcoma
  
• Plasmacytoma
  
• Gastrointestinal stromal tumors (GIST)
  

Benign stomach tumors in dogs are less commonly diagnosed and may include:

• Leiomyoma
  
• Adenomatous polyps (rare)
  

Gastric Adenocarcinoma in Dogs

It is the most common stomach cancer in dogs, 50–90% of all canine gastric malignancies. It originates in the glandular tissue of the stomach lining and tends to grow quickly, often spreading to nearby organs like the liver or lymph nodes. It has a guarded to poor prognosis because it has most often already spread throughout the body at the time of diagnosis. Dogs with gastric adenocarcinoma have a median survival time of approximately 6 months after surgical treatment.

Gastric Leiomyosarcoma in Dogs

Leiomyosarcoma is the second most common type of stomach cancer in dogs and arises from smooth muscle cells. It generally occurs in very old dogs – the average age is 15 years. Beagles are more prone to it (82% prevalence in dogs aged 17-18 years) than any other breed.

It appears as discrete solitary lesions, usually pediculated (i.e., the tumor is attached to a small cord-like or stalk-like). The average survival time after surgical excision is 21 months.

Gastrointestinal Lymphoma in Dogs

This type of stomach cancer is rare in dogs and more common in cats. This type of lymphoma is also called alimentary lymphoma. Organs that can be affected include the intestines, stomach, and lymph nodes in the abdomen.

In some cases, GI lymphoma can be an extension of multicentric (systemic) lymphoma. This type of cancer usually focuses on high-grade forms, which are aggressive and fast-growing compared to small cell GI lymphoma, which is less aggressive and slow-growing (and rare in dogs). The mean survival time for dogs with small cell GI lymphoma is around 9 months to 2 years. High-grade lymphoma has a shorter survival time.

Gastric Plasmacytoma in Dogs

This type of stomach cancer in dogs is rare and arises from plasma cells, which is a differentiated form of bone marrow-derived B lymphocytes. Cancerous transformation of these cells leads to the formation of cutaneous tumors, extramedullary (outside the bone marrow) plasma cell tumors, solitary bone tumors, and multiple myeloma. The most common locations of plasmacytomas in dogs are:

• Oral cavity
  
• Ear pinnae
  
• Lips
  
• Chin
  
• Trachea
  
• Larynx
  
• Stomach
  
• Colon
  
• Toes
  

Gastric plasmacytoma is an extramedullary tumor and can be benign or malignant (most often malignant). It occurs in dogs aged 9-10 years, having a longer average survival time than other types of gastric cancer (approximately 30 months from diagnosis).

Gastrointestinal Stromal Tumors (GIST) in Dogs

GIST is a malignant mesenchymal cancer that arises from the intestinal cells of Cajal. This type of gastrointestinal cancer in dogs is quite rare, occurring most commonly at the level of the small intestine and cecum in dogs - the gastric form is frequently found in humans. It is an aggressive cancer, especially when it is located in the small intestine. The median survival time is 6 months when it is located in the small intestine and 22 months when it is located in the cecum.

Gastric Leiomyoma in Dogs

It is a benign (non-metastasizing) cancer rarely found in dogs (in less than 1% of cases) that originates from the smooth muscle. Most of the time, this cancer is diagnosed accidentally. It is an asymptomatic cancer – clinical signs appear only when the tumor is large.

How Does Stomach Cancer In Dogs Differ From Other Gastrointestinal Problems?

Although stomach cancer in dogs can have similar clinical signs to other gastrointestinal problems, there are a few differences that can help distinguish it.

1. Development

Stomach cancer often leads to large tumors that can obstruct the passage of food or lead to gastric perforations.

On the other hand, gastrointestinal problems often lead to inflammation (rather than the formation of abnormal masses) and are caused by parasites, infections, food allergies, inflammatory bowel disease, etc.

2. Onset and duration of the clinical signs

Stomach cancer is often asymptomatic or the clinical signs are vague in its early stages and may be overlooked. As the tumor grows (over weeks or months), symptoms may appear and worsen over time. Vomiting (most common), abdominal pain, loss of appetite, lethargy, and weight loss are clinical signs that usually appear in the advanced stages of the disease.

Gastrointestinal problems such as gastritis or gastroenteritis usually occur suddenly and are short-lived. For example, acute gastritis is related to dietary indiscretions, toxins, or infections and often causes sudden vomiting and loss of appetite. However, the clinical signs may resolve once the underlying cause is treated.

3. Clinical signs

Gastric cancer clinical signs in dogs:

• Persistent vomiting (sometimes it can be blood-tinged or resemble coffee grounds due to tumor ulceration or breaking open)
  
• Melena (black, tarry stools) or hematochezia (fresh blood in the stool) due to gastric bleeding
  
• Excessive salivation (drooling)
  
• Weight loss and loss of appetite
  
• Abdominal swelling or discomfort
  
• Abdominal pain
  
• Decreased activity
  
• Lethargy or the unwillingness to move
  
• Vocalization
  
• Pale gums (indicates anemia caused by chronic blood loss)
  
• Modified behavior (e.g., urinating and defecating indoors, snapping, excessive licking, etc.)
  

Gastrointestinal issues clinical signs:

• Sudden, intense vomiting
  
• Nausea
  
• Abnormal stool/diarrhea with or without blood (more common in cases of gastroenteritis or intestinal parasites)
  
• Increased thirst ( polydipsia)
  
• Dehydration
  
• Abdominal discomfort or bloating (in cases such as gastritis or intestinal obstructions)
  
• Lethargy
  

4. Age of onset

Stomach cancer usually occurs in older dogs (over 7-9 years of age), being a progressive condition that develops slowly, making early diagnosis difficult.

Gastrointestinal conditions such as gastritis, gastroenteritis, or intestinal parasites can affect dogs of any age. However, in young dogs, gastrointestinal problems often occur due to changes in diet, parasites, or infections.

5. Diagnostic process

Stomach cancer in dogs is diagnosed by several methods:

• Imaging methods (abdominal x-rays or ultrasound) - to detect signs of a mass in the stomach.
  
• Endoscopy - it allows direct visualization of the stomach lining and biopsy collection.
  
• Biopsy - it is crucial for confirming cancer and determining its type.
  

In the case of gastrointestinal problems, many of them are diagnosed based on the clinical signs and responses to treatment without the need for a gastric biopsy. In addition, gastritis or gastroenteritis can also be diagnosed through fecal tests (for intestinal parasites), blood tests, rapid tests (for infections such as parvovirus), or abdominal ultrasound.

6. Treatment

Regarding the treatment of stomach cancer, it mainly consists of surgery to remove the tumor (if it is operable). In addition, radiation therapy or chemotherapy may be used, especially if the cancer has spread throughout the body. The vet may also give the affected dog intravenous fluids, anti-nausea medication, and/or pain medication to support the body. The prognosis for stomach cancer is usually poor if it is diagnosed in the later stages. The survival time is usually measured in months rather than years.

Gastrointestinal problems usually involve medication to control vomiting, nausea, or diarrhea and supportive care (intravenous fluids, vitamins, etc.). In addition, rest and a change in diet may be recommended depending on the severity of the condition. Antibiotics or dewormers may be used for infections or parasites, with most cases resolving with appropriate treatment. Many gastrointestinal problems, such as gastritis, intestinal parasites, or gastroenteritis, are treatable and have a much better prognosis, with most dogs recovering within a few days to a few weeks with proper care.

What Are The Causes And Risk Factors Of Stomach Cancer In Dogs?

The causes of stomach cancer in dogs are unknown. However, certain factors may increase the risk of developing this type of cancer, such as:

• Age – Stomach tumors tend to occur more often in older dogs.
  
• Sex – Male dogs are at higher risk of developing stomach tumors than females (both benign and malignant).
  
• Breed – Beagles are at higher risk of developing gastric leiomyomas. Other breeds with an increased risk of stomach cancer include the Norwegian Lundehund, Standard Poodle, Rough Collie, Chow Chow, Belgian Shepherd, Belgian Tervuren, and Staffordshire Terrier. This breed-specific risk may indicate a genetic predisposition.
  
• Chronic inflammation – In dogs, chronic gastritis is associated with the development of stomach cancer.
  
• Environmental factors – Exposure to pesticides or poor-quality food can lead to the development of stomach cancer. For example, gastric adenocarcinoma in dogs may be associated with long-term feeding of diets containing nitrosamines (a chemical found in many foods).
  

What Are The Clinical Signs And Symptoms Of Stomach Cancer In Dogs?

Early Signs of Stomach Cancer

In the early stages, stomach cancer may be asymptomatic or subtle, and can be easily confused with other gastrointestinal diseases. Here's what you may notice:

• Loss of appetite (inappetence)
  
• Intermittent vomiting (mild at first)
  
• Lethargy and reduced enthusiasm for play or exercise
  

Advanced Signs of Stomach Cancer

As the tumor grows or the disease progresses, clinical signs may become more pronounced. Here's what you may notice:

• Significant weight loss due to poor food intake
  
• Persistent vomiting, sometimes with blood (hematemesis)
  
• Melena (black, tarry stools) or hematochezia (fresh blood in the stool) due to gastric bleeding
  
• Abdominal pain or tenderness, sometimes leading to a hunched posture
  
• Possible abdominal distension (due to tumor growth)
  
• Behavioral changes (growling, snapping, irritability, hiding, reduced interaction with family members or other pets)
  
• Reluctance to move or exercise
  

However, clinical signs may be similar to those of other conditions, such as chronic gastritis, inflammatory bowel disease, and gastric ulcer. For this reason, abdominal ultrasound, endoscopy, and/or biopsy are often required for a definitive diagnosis.

How Is Stomach Cancer In Dogs Diagnosed?

Several diagnostic methods are used to detect stomach cancer in dogs. Any diagnosis begins with the patient's evaluation and observation of clinical signs (if they are present at the time of presentation to the clinic) that may include chronic, persistent vomiting, progressive weight loss, hypersalivation, enlarged abdomen, etc.. In addition, stomach cancer in its early stages can mimic other non-cancerous gastric diseases. As a result, the veterinarian would have a higher suspicion of this condition in older dogs or those of the breeds mentioned above.

Here is what diagnosing stomach cancer in dogs involves:

1. Initial diagnosis

The initial diagnosis includes methods that can help rule out other conditions that may have similar clinical signs or detect changes that may occur due to gastric cancer. As a result, your veterinarian may recommend:

• Blood chemistry – for example, it may reveal electrolyte imbalances secondary to vomiting.
  
• Complete blood count (CBC) – may show anemia, which is suggestive of chronic blood loss or inflammation/infection in the body.
  
• Urinalysis – may be recommended to assess your dog's health status before surgery if stomach cancer has been diagnosed.
  

2. Imaging tests

This category includes:

• X-rays (abdominal and chest) to detect cancer and lung metastases, if applicable.
  
• Abdominal ultrasound to evaluate the stomach wall and regional lymph nodes and identify the mass.
  
• CT or MRI (advanced imaging techniques) to assess the extent of the stomach cancer and if it has metastasized (spread throughout the body). In addition, these exams are necessary to plan the surgery (tumor resection).
  

3. Endoscopy with biopsy

Endoscopy helps visualize the lesions of the stomach mucosa and take tissue samples for biopsy. However, if the cancer is in the submucosa (e.g., carcinoma), and the sample is taken from the stomach mucosa, a biopsy can lead to false negative results.

4. Surgical biopsy

Surgical biopsy is another method of diagnosing stomach cancer in dogs that involves surgically removing a portion of the tumor or the entire tumor. The tissue sample collected will be sent to the lab for histopathological examination, which is the gold standard for diagnosis.

5. Fine needle aspiration (FNA)

Ultrasound-guided FNA of the tumor and lymph nodes can help with diagnosis. The aspirated cell sample will be examined under a microscope for diagnosis –  it is called cytological examination. However, the result of the FNA may be inconclusive, which requires repeating the FNA or recommending a biopsy.

6. Tumor staging

If stomach cancer is confirmed, chest X-rays, abdominal ultrasound, and sometimes CT scans or MRIs are done to check if the cancer has spread to other regions. After a definitive diagnosis, the cancer will be staged using the TNM system (T – tumor, N – regional lymph nodes, M – distant metastasis). Staging helps veterinarians plan the most appropriate treatment.

What Are The Treatment Options For Stomach Cancer In Dogs?

Treatment of stomach cancer in dogs depends on several factors, such as:

• Type of cancer
  
• Stage of cancer
  
• Location
  

Although the prognosis of stomach cancer in dogs is reserved, combining multiple treatment options may prolong survival time and improve quality of life in some cases. Here are the treatment options available:

1. Surgery

This is the treatment of choice in the majority of cases of gastric cancer when possible. For surgery, the tumor must be solitary and localized, and the dog to be a good candidate for general anesthesia. Even after complete surgical excision, the median survival time is often less than 6 months for gastric adenocarcinoma.
Sometimes, surgical removal may be recommended even if the dog already has metastases to improve their quality of life and relieve symptoms.

2. Chemotherapy

Chemotherapy may be recommended post-surgery to neutralize the remaining cancer cells in the body or in cases where the tumor is inoperable or if there are metastases.

Chemotherapy drugs are administered intravenously slowly every 2 or 3 weeks by an oncologist. In total, 4-5 treatment sessions may be needed.

Unlike humans, pets are not as sensitive to the adverse effects of chemotherapy. So, you will not see their hair fall out (in most dogs), but you may notice that your dog loses their appetite or has mild vomiting.

3. Radiation therapy

Radiation therapy generally uses high-energy particles or electromagnetic waves, such as X-rays, gamma rays, electron beams, or protons, to destroy or damage the structure of cancer cells (the DNA of cancer cells). It is a painless, non-invasive procedure that is performed under sedation. Treatment can last 3-4 weeks for standard radiation therapy.

Although it targets cancer cells, radiation therapy can also lead to some side effects, such as fatigue, discomfort in the area where the treatment was administered, or skin problems. In addition, according to studies, irritation of the small intestine (radiation enteritis) can occur towards the end of the second week of treatment. This side effect can lead to clinical signs such as fever, watery diarrhea, increased frequency of bowel movements, vomiting, and acute weight loss. These signs can last 2-4 weeks post-radiotherapy.

Radiotherapy is generally recommended for localized tumors that cannot be removed surgically.

4. Palliative care

Palliative and supportive treatment is often recommended in terminal cases or when aggressive therapy is not applied. These may include:

• Anti-vomitive medication (maropitant, ondansetron)
  
• Gastroprotectors (omeprazole, sucralfate)
  
• Pain medication (opioids, NSAIDs if there are no contraindications)
  
• Appetite stimulants (mirtazapine, capromorelin)
  
• Easily digestible diets, rich in protein
  
• Feeding tubes if for dysphagia (difficulty swallowing) or obstruction
  

5. Integrative therapies

When conventional treatments don't work, or perhaps you simply want a holistic approach, there are some natural substances that offer moderate anti-cancer support, especially valuable for prevention, immune modulation, and improving quality of life. As a result, a wide variety of medicinal mushrooms, herbal remedies, and tonics can help your dog with stomach cancer.

Shiitake Mushroom (Lentinula edodes) – This medicinal mushroom can enhance your dog’s immune system. According to studies, people suffering from stomach, colorectal, pancreatic, and liver cancers who were given shiitake mushrooms had an extended survival time. Zumalka’s SHIITAKE product is specially crafted to promote a strong immune system and healthy liver function. This powerful medicinal mushroom is packed with vital nutrients like vitamins B2 and B12. SHIITAKE helps boost your dog’s vitality, strengthens their natural defenses, and fights off environmental stressors, so they can feel their best every day.

Reishi Mushroom (Ganoderma lucidum) – Studies on people show that Reishi mushrooms can suppress protein synthesis and tumor growth. Zumalka’s Reishi product is a natural supplement packed with antioxidants. It can give your dog the extra strength they need to help their body fight cancer better. Reishi mushrooms are traditionally used to enhance the immune system and support healthy cell function. It promotes liver health and reinforces the body’s natural defense mechanisms during tough treatments like chemotherapy. This natural supplement is a beneficial addition to your dog’s daily care.

Turkey Tail Mushroom (Coriolus versicolor) – Zumalka’s Coriolus (Turkey Tail) formula is a potent, natural supplement designed to support your dog’s cellular health and immune recovery. It is rich in polysaccharide-K (PSK), a prebiotic compound that promotes a healthy gut microbiome, helping to strengthen the immune function and support recovery. Rich in antioxidants and essential compounds, this powerful formula promotes your dog’s overall well-being, making it the perfect addition to their daily care.

CBD Oil (Cannabidiol) – It is beneficial for reducing pain, inflammation, and anxiety in pets. Studies performed on mice, dogs, and monkeys have shown that CBD oil can have anticancer effects. It is also effective in reducing the side effects of chemotherapy drugs.

Astragalus, Milk Thistle, and Curcumin (from turmeric) are natural remedies with immune-boosting and anti-inflammatory benefits for your dog. They can also help support their liver, especially when they are under chemotherapy treatment. Zumalka’s HEPATOPET product is an excellent liver tonic for pets that contains all of these natural ingredients and more.

Birch Polypore (Fomitopsis betulina) – A medicinal mushroom used for centuries in humans to treat and alleviate various conditions and symptoms. It was shown to have many properties, including anti-inflammatory, antibacterial, antiviral, antioxidant, and anticancer. Zumalka’s PIPTOPET is a mother tincture featuring Fomitopsis betulina, traditionally used to help support your dog’s natural defenses and overall wellness. It can be part of a comprehensive daily routine for dogs needing immune and digestive system support during their fight with cancer.
To complement PIPTOPET, you may also consider the following TONICPET formulas:
TONICPET #4: Supports healthy circulation and oxygenation throughout the body, helping promote vitality and general well-being.
TONICPET #5: Helps maintain proper blood flow and supports the health of your dog’s vital systems.
TONICPET #7: Encourages immune system function and supports the body’s natural processes.
TONICPET #10: Assists in maintaining pH balance and digestive system health, contributing to a more harmonious internal environment.
Additionally, RBC+ from Zumalka is a natural formula that supports red blood cell health and hemoglobin levels, helping to promote energy and overall vitality, especially in dogs that may need extra blood-building support.

By combining these products, you can provide your dog with powerful, natural support to boost their immune system and overall health.

Always consult a holistic vet before using any natural remedies or products.

Prognosis And Quality Of Life Of Dogs With Stomach Cancer

Stomach cancer in dogs has a poor prognosis. Most dogs diagnosed do not live more than 6 months after diagnosis. The untreated dogs live for around 3 months. Even with surgical removal of the tumor, dogs can still live for only several months. In rare cases, dogs have lived 3-4 years after diagnosis. However, early detection of stomach cancer in dogs can increase life expectancy.

In terms of quality of life, dogs with stomach cancer may experience pain around the stomach or abdomen. Also, the final stages of this type of cancer lead to poor quality of life as the dog vomits chronically, loses severe weight, and is very lethargic. At such times, veterinarians may recommend humane euthanasia.

Coping with the Diagnosis

A cancer diagnosis can be devastating and heartbreaking, and the emotional impact is often profound. Some owners even begin to mourn the loss of their dog right after a cancer diagnosis. You may feel guilty, wondering if you could have done something else before the diagnosis, if you made the right decision, or if you did enough for your beloved pet.

Watching a family member decline can bring you feelings of helplessness and frustration, as no amount of love or care can stop the progression of the disease, unfortunately. Anxiety about choosing the "right time" to euthanize your dog can also be intense, creating emotional turmoil and the fear of acting too soon or too late.

After their pet's passing, many people experience profound sadness, guilt, and a deep sense of emptiness.

It is important to recognize that these emotions are natural, that grieving the loss of your pet is real and valid, and that offering love and comfort in your dog's final days is a powerful and compassionate act.

Frequently Asked Questions (FAQs)

What are the signs of stomach cancer in dogs?

Stomach cancer in dogs in its early stages is often asymptomatic or presents with subtle clinical signs, which can delay diagnosis. In more advanced stages, owners may notice the following symptoms: chronic, persistent vomiting, decreased appetite and weight loss, enlarged abdomen, abdominal pain, diarrhea or loose stools, sometimes with blood, behavioral changes, and respiratory problems (in severe cases).

How long can a dog live with stomach cancer?

The average survival time for dogs diagnosed with stomach cancer that remain untreated is approximately 3 months. Those that undergo treatment (especially surgery) have an average survival time of approximately 6 months. However, there are cases in which dogs have lived for 3-4 years post-treatment. It is also important to remember that survival time also depends on certain factors such as the type of cancer, the stage of the cancer, and the general health of the dog.

What is the life expectancy of a dog with cancer?

Depending on the type of cancer, dogs can live from a few weeks to a few months, especially those that do not receive treatment. When dogs with cancer are treated (surgery, chemotherapy, or radiation therapy), the survival time can increase from a few months to a few years (usually 1-2 years), depending on the type of cancer, stage of cancer, and the dog’s general health.

What is the last stage of cancer in dogs?

The final stage in dogs with cancer is stage 4 (terminal stage or end stage). In this stage, in addition to the primary tumor, which is macroscopic in size (visible to the naked eye), the regional lymph nodes are affected, and the cancer has spread throughout the body (metastasized). In addition, the cancer is often considered incurable at this stage, although vets may still offer treatments to slow progression or relieve symptoms. The clinical signs are usually severe because the cancer affects multiple body systems.

What are the symptoms of abdominal cancer in dogs?

 Abdominal cancer means that it can affect the stomach, liver, spleen, intestines, pancreas, kidneys, or lymph nodes. As a result, it is difficult to say what the symptoms of abdominal cancer are because they can vary depending on the organ it affects. However, the general clinical signs of abdominal cancer in dogs may include an enlarged abdomen, lack of appetite, weight loss, vomiting, diarrhea, lethargy, and behavioral changes. If you notice any of these signs, take your dog to your veterinarian for proper diagnosis and treatment.

What are the early symptoms of intestinal cancer in dogs?

Early clinical signs of intestinal cancer in dogs may include vomiting, diarrhea, loss of appetite, and weight loss. As the disease progresses, abdominal pain, bloody vomiting, bloody stools, and an urge to defecate may occur. If these clinical signs appear, it is important to take your dog to a vet for proper diagnosis and treatment.

Are there warning signs your dog has cancer?

If your dog is suffering from cancer, they may show signs of depression, lethargy, and decreased exercise tolerance. They will also sleep more than usual. In addition, you may notice that they are not as playful as before or that they do not want to go for walks as much. However, these clinical signs are not specific to cancer and can also be seen in other diseases. So, if your dog is no longer behaving normally, it is time to take them to the vet.

What are the symptoms of gastric cancer in dogs?

In its early stages, stomach cancer in dogs often results in no noticeable symptoms or only very mild signs, making early diagnosis challenging. As the disease progresses, more obvious symptoms may develop, including chronic vomiting, reduced appetite, significant weight loss, abdominal enlargement, signs of abdominal discomfort, diarrhea or loose stools that may contain blood, changes in behavior, and, in severe cases, respiratory difficulties.

How do dogs act when they have cancer?

When dogs have cancer, they often act more tired, less playful, and may lose interest in food or activities they once enjoyed. They might seem withdrawn, show signs of pain, vocalize, and may experience weight loss, vomiting, diarrhea, or changes in behavior such as irritability or clinginess.

What are the symptoms of bowel cancer in dogs?

Bowel cancer is an aggressive cancer that can lead to clinical signs such as loss of appetite, weight loss, vomiting (sometimes bloody), diarrhea or loose stools (sometimes bloody), abdominal pain and swelling, lethargy, depression, decreased energy, or shortness of breath. The cancer must be diagnosed as early as possible for a better prognosis.

How does a dog act with stomach cancer?

A dog with stomach cancer may show signs such as chronic, persistent vomiting, loss of appetite, weight loss, abdominal pain, diarrhea or loose stools, lethargy, and behavioral changes like irritability or clinginess. Their abdomen may also appear enlarged, especially in advanced stages.

What is the life expectancy of a dog with stomach cancer?

The life expectancy of dogs diagnosed with stomach cancer is not very high. Dogs left untreated live an average of 3 months, while those that undergo treatment (especially if the tumor is surgically removed) have an average survival rate of 6 months. However, there are cases in which dogs have lived for over 1 year, but it depends on the type of stomach cancer, its stage, and your pet’s general health.

What does stomach cancer in dogs look like?

Stomach cancer in dogs often presents with signs like persistent vomiting (sometimes with blood), loss of appetite, and weight loss. As the cancer progresses, you might notice abdominal pain, bloating or swelling, diarrhea (sometimes bloody), and a lack of energy or lethargy. In more severe cases, dogs may exhibit behavioral changes like irritability.

About the author

Dr. Iuliana Mihai, DVM, MSc, PhD

Iuliana Mihai, DVM, MSc, PhD, is a Bucharest-based veterinary expert specializing in internal medicine and oncology.

Her work has been published in reputable publications such as Veterinary Medicine Journal, Catster.com, Dogster.com, Hepper.com, Meowiz.com, Springnaturals.com, Petkeen.com, and Wilderharrier.com.

She is a malpractice and negligence veterinary consultant and a graduate of The University of Agronomic Sciences and Veterinary Medicine and The Romanian Academy.

Read the complete profile of Dr. Iuliana Mihai, DVM, MSc, PhD (Veterinarian) here.