Thanks for reaching out with your concern about your cat. It sounds like you're noticing something quite unsettling, and I want to help you get to the bottom of it.
When a cat is losing muscle mass despite having a good appetite, there are a few possibilities to consider. One potential cause is hyperthyroidism, a condition where the thyroid gland is overactive, speeding up metabolism and leading to muscle loss. Diabetes is another possibility, as it affects how your cat's body processes glucose and can cause weight and muscle loss if untreated. Parasites or certain gastrointestinal issues might also lead to inadequate nutrient absorption, despite a fine appetite.
At home, monitor your cat's behavior and energy levels closely. Ensure your cat is eating high-quality food. If you're noticing anything unusual like vomiting, diarrhea, excessive thirst, increased urination, or changes in behavior, those are signs that warrant closer medical attention.
Given the symptoms you've described, it’s a good idea to schedule a video consult with Dial A Vet. A vet can further assess your cat's condition, and may suggest specific tests or treatments to address the underlying cause of the muscle loss.
Clinically Approved Standard by Dial A Vet Veterinary Team
Disclaimer: The customer and expert messages presented herein may have been altered with artificial intelligence or modified to enhance readability and safeguard the privacy of individuals. This content is for informational purposes only and is not a substitute for professional veterinary advice, diagnosis, or treatment. If your pet is experiencing a medical emergency, contact your local veterinarian or emergency animal hospital immediately. Talk to a vet now.

