The goal of supportive care for a dog or cat with cancer is to keep the animal comfortable and maintain or improve its quality of life. The American Animal Hospital Association (AAHA) states this directly in Section 7 of its 2026 Oncology Guidelines for Dogs and Cats, published January 1, 2026: “The primary objective of symptomatic therapy for oncology patients is to maintain or improve quality of life by mitigating discomfort and resolving or alleviating clinical signs.”
Section 7 is written for veterinary teams. This article translates it into the questions to raise with your veterinarian. It is not a list of medicines to give at home, and no treatment in it should be started, stopped, or changed without your vet’s direction.
What Section 7 covers
Supportive care, sometimes called symptomatic care, addresses the effects of cancer and its treatment rather than the tumor itself. AAHA asks the veterinary team to build each plan around the individual animal: its disease, any other illnesses it has, its limitations, and the goals and preferences of the family. The section also expects general practitioners and oncologists to communicate about the plan when both are involved in a case.
Three takeaways from AAHA
- Evaluate the whole animal first. Before adding symptom treatment, the team should assess the patient thoroughly, including checking for comorbidities, because another illness can change which options fit.
- Pain and discomfort can have several sources. They may come from the cancer itself (AAHA’s example is pain from osteosarcoma), from treatment such as radiation or chemotherapy, or from an unrelated disease process.
- Nutrition needs routine checks. Nutritional status should be assessed at diagnosis and throughout treatment, not only when appetite drops.
Symptom-by-symptom options in Table 7.1
AAHA’s Table 7.1 groups supportive-care options by symptom or need. Listing an option does not mean it suits every animal. The veterinary team selects, dose-adjusts, and monitors any drug or intervention.
| Symptom or need | Options listed in Table 7.1 |
|---|---|
| Vomiting | Maropitant, ondansetron, metoclopramide |
| Reduced appetite (hyporexia) | Capromorelin oral solution, mirtazapine, prednisone or prednisolone |
| Diarrhea | Crofelemer-CA1, probiotics, smectite (with or without metronidazole), fiber |
| Other gastrointestinal support | Dietary support, therapeutic diet, antacids, motility drugs, vitamin B12, probiotics, feeding tubes |
| Bone marrow suppression | Not treated in Section 7; AAHA refers readers to the discussion of neutropenia in Section 5 |
Nausea and appetite
If nausea may be behind a reduced appetite, the section advises treating the nausea first. Capromorelin and mirtazapine can be given by mouth to both dogs and cats. For cats, AAHA notes that mirtazapine is also available as a transdermal ointment. Whether any of these suits your pet, and at what schedule, is a decision for your veterinarian.
Diarrhea
AAHA describes a shift away from routine empirical antibiotics for acute diarrhea. The aim is antibacterial stewardship and protecting the normal gut microbiome. Crofelemer-CA1 delayed-release tablets are conditionally FDA-approved for chemotherapy-induced diarrhea in dogs.
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AAHA also summarizes two small studies. A probiotic study is described in the section, and a study in dogs with chemotherapy-induced diarrhea reported faster symptom resolution with smectite than with metronidazole. These findings are limited, and they should not be read as proof that every dog will respond the same way.
Pain: where it comes from and how it is managed
Cancer-related pain may come from the tumor, from a cancer treatment, or from a concurrent condition. AAHA recommends a multimodal approach, combining more than one type of treatment, and refers veterinarians to the 2022 AAHA Pain Management Guidelines for Dogs and Cats. The section states that treating the underlying disease is usually the most effective form of pain management. When that is not feasible or not wanted, palliative-intent radiation is presented as an option.
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Palliative-intent radiation
According to AAHA’s 2026 summary of human and animal studies, 70 to 90 percent of patients with cancer-related pain had significantly reduced pain after palliative-intent radiation therapy. AAHA says the duration of relief varies widely, from a few months to more than a year, depending on tumor type. These figures describe what happened across the studies AAHA summarizes. They are not a guarantee for your pet or a prediction of its prognosis.
Medication options for veterinary consideration
AAHA lists the following options for the veterinary team to weigh:
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- Nonsteroidal anti-inflammatory drugs (NSAIDs)
- Bedinvetmab for dogs and frunevetmab for cats
- Buprenorphine and other opioids
- Gabapentin or pregabalin, which AAHA describes as having mixed effectiveness as adjunctive pain management in dogs and cats
- Bisphosphonates
The section also describes postoperative buprenorphine formulations and durations for cats. Choosing and using any of these belongs to your veterinarian. Do not give a pet pain medicine from a human supply or an earlier prescription for another animal.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Nutrition and feeding support
AAHA’s core dietary goal is food that is palatable and actually eaten, while remaining complete and balanced. The diet should be chosen with the cancer diagnosis, other conditions such as pancreatitis or kidney disease, the animal’s nutritional needs, your household routine, and your ability to follow the plan in mind. A commercial or homemade diet can meet the goal if it is properly formulated.
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ONC Care therapeutic diet
The section names ONC Care as a newly released therapeutic diet, describing high palatability and a positive effect on body weight in tumor-bearing dogs. This is a product mention in clinical guidance, not a statement that the diet suits every dog or cat. Ask your veterinary team whether it fits your pet’s diagnosis and other health issues.
Homemade and raw diets
For homemade diets, AAHA recommends consulting a veterinary nutritionist, because formulating a balanced diet is difficult. AAHA does not recommend raw diets for oncology patients. It notes that immunocompromised animals and the people caring for them may face higher risks of Salmonella and Escherichia coli infection from raw meat-based diets. Exposure can occur through saliva, fur, or cleaning up meals.
When appetite does not recover: feeding tubes
If anorexia continues despite medical management, AAHA advises discussing feeding-tube placement. The examples given are esophagostomy, nasoesophageal, and percutaneous endoscopic gastrostomy (PEG) tubes. The section notes that tube support may matter most early in disease or after surgery, while the team waits to see whether treatment is working. In hospice cases, the decision weighs overall goals, quality of life, and prognosis. It is made between the veterinarian and the owner.
Questions to bring to your veterinarian
- Has my pet been checked for other conditions that could affect which symptom treatments fit?
- Is this symptom coming from the tumor, from the treatment, or from another illness?
- Which options fit my pet’s species and health history, what benefit should we expect, and how soon?
- When were my pet’s weight and nutritional status last assessed?
- If my pet keeps eating poorly, at what point would a feeding tube be discussed?
- For pain, would palliative radiation or medication come first, and how will we know it is working?
AAHA’s guidance does not rank these options against each other, so the choice depends on your pet’s individual picture and your family’s goals.
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