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Health A-Z

Common Pet Conditions

Start with a symptom, then learn what to monitor and what your vet may check.

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Clear symptoms
abnormal bleeding or discharge (1) and lethargy. For example (1) but any lump should be checked) (1) drooling (1) lameness or swelling in the bone (for bone cancers) (1) lymphomas may cause enlarged lymph nodes (1) or difficulty eating. Any unusual new symptoms in an older dog can be a red flag (1) oral cancers might present as foul breath (1) Signs of cancer vary widely with the type and location. Possible signs include a persistent lump or swelling (not all are malignant (1) sores that don’t heal (1) unexplained weight loss or loss of appetite (1)
Symptom matches are best-effort. If a symptom is severe or sudden, contact a veterinarian promptly.

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Cancer
Dog - All Breeds (more common in older dogs; certain breeds prone to specific cancers)
Signs of cancer vary widely with the type and location. Possible signs include a persistent lump or swelling (not all are malignant but any lump should be checked) sores that don’t heal abnormal bleeding or discharge lameness or swelling in the bone (for bone cancers) unexplained weight loss or loss of appetite +5 more

Cancer in dogs is a broad group of diseases where cells grow uncontrollably, invade surrounding tissue, and m…

For pet owners
Use this page to learn what a symptom can mean, what to track at home, and when to get help. Bring notes to your appointment (timeline, appetite, water intake, urination, stool, vomiting episodes, medications and supplements).
For veterinary perspective
Each condition page summarizes common presentations, typical evaluation steps, and treatment approaches. It is not a substitute for diagnosis. Your veterinarian will consider breed, age, exam findings, and tests.