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Common Pet Conditions

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

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Clear symptoms
a transient fever and lymph node enlargement may occur but are often missed. Later (1) and anemia (1) and general poor condition develop. Advanced cases can show persistent fever (1) chronic secondary infections (eg (1) diarrhea (1) neurologic issues (1) Often no signs early on. Within 1–3 months after infection (1) recurrent gum infections (1) respiratory or skin infections) (1) weight loss (1)
Symptom matches are best-effort. If a symptom is severe or sudden, contact a veterinarian promptly.

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Image for Feline Immunodeficiency Virus (FIV)
Feline Immunodeficiency Virus (FIV)
Cat - All breeds (outdoor, fighting tomcats at highest risk)
Often no signs early on. Within 1–3 months after infection a transient fever and lymph node enlargement may occur but are often missed. Later chronic secondary infections (eg recurrent gum infections respiratory or skin infections) weight loss +4 more

A retrovirus (lentivirus) that attacks the immune system, analogous to HIV in humans. It is spread primarily …

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.