Weight Loss
Weight loss is one of the most common presenting signs in veterinary medicine and a shared symptom across many serious feline and canine conditions. When a pet is losing weight -- especially an older cat -- the differential diagnosis list includes several major diseases that must be ruled out systematically.
Key Facts
- Hallmark sign of hyperthyroidism (weight loss DESPITE an excellent appetite)
- Progressive sign in chronic-kidney-disease (especially Stages III-IV, accompanied by reduced appetite)
- Common in all forms of lymphoma, especially intestinal and renal-lymphoma
- Weight loss combined with increased appetite strongly suggests hyperthyroidism
- Weight loss combined with decreased appetite points toward CKD or lymphoma
- Maintaining healthy weight is a central goal of nutrition management
- Species: dogs and cats
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Common symptom in advanced CKD, shared with hyperthyroidism and lymphoma.
Muscle wasting occurs from protein breakdown
Progressive weight loss despite adequate food intake
Pain from stomatitis causes reduced eating and weight loss
The hallmark sign, shared with CKD and lymphoma.
Chronic IBD leads to progressive weight loss.
Common with advanced lung cancer
Shared symptom across intestinal, renal, and other lymphoma forms, and across CKD and hyperthyroidism.
Shared across CKD, hyperthyroidism, and all lymphoma forms.
อาการ
Chronic diarrhea contributes to weight loss.
Opposite problem but interconnected through nutrition management.
Often co-occurs with polydipsia in CKD, hyperthyroidism, and lymphoma.
Reduced appetite drives progressive weight loss.
Chronic vomiting contributes to weight loss.