Muscle loss in senior cats: muscle condition scoring
15-year-old cat at a check-up. His body condition score is 5/9, but on palpation there is moderate muscle loss over the spine, scapulae and pelvis. He has lost 0.6 kg over the past year and eats slightly less than before.
Which statement is correct?
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A. His body condition score is ideal, so there is nothing to worry about
Body condition score mainly assesses fat. Muscle mass is assessed separately and can be markedly reduced even with a normal or even high body condition score.
B. He should switch to a low-protein diet to protect his kidneys because of his age
Senior cats usually need more protein, not less, because they digest it less efficiently. Restricting it without an indication (such as kidney disease that requires it) accelerates muscle loss.
C. The muscle loss should be investigated: it may be due to disease (hyperthyroidism, kidney disease, neoplasia, enteropathy, pain) and adequate energy and protein must be ensured
Correct. Loss of muscle mass, whether age-related sarcopenia or disease-related cachexia, is associated with a worse prognosis. Look for the cause and ensure sufficient calories and high-quality protein.
D. Muscle loss is normal in a senior cat and does not need investigating
Although sarcopenia is common with age, moderate muscle loss with progressive weight loss requires treatable diseases to be ruled out.
lightbulb Key takeaway
At every check-up record body weight, body condition score (1–9) and muscle condition score (normal, or mild, moderate or severe loss). Palpate the spine, scapulae, skull and pelvis: muscle loss often appears before fat loss.
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Updated: October 31, 2026 · Educational content for veterinary professionals. It does not replace current clinical guidelines or the judgement of the attending veterinarian.