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My hamster is losing weight and lethargic. Is he sick or old?

Updated on September 23rd, 2025

Pet's info: Small Animal | Hamster | Male | unneutered | 1 year and 9 months old

Hello, my hamster is acting weird. He has become antisocial, less active and happy (I think). He weighted around 172g and now he weights 142g; in 6 month gap. Should I be worried? Is it because he is getting old? I give him yolk, salads and little pieces of apple in his main dish. I also give him yoghurt drops as a treat and dry food; treats that have beneficial immunity boost cream inside of it. He is active after 1am and only runs on his wheel for few hours, which he hasn't done that before.

1 Answer

Most Helpful Answer

Todd Cecil

Answered By Todd Cecil

Veterinarian

Published on February 21st, 2019

Thanks for reaching out about Vasia. It would be a mild concern that she has lost 20% of his body weight. Age is not a disease, and some organ system is probably responsible for the weight loss. Renal disease is fairly common in aging hamsters.
Try and monitor water consumption and urination.
Good luck.
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