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Why is my mouse breathing heavily, losing weight, and acting tired?

Updated On September 23rd, 2025

Pet's info: Small Animal | Mouse | Male | unneutered | 2 years and 1 month old

Hi there i am in need of help about my mouse, i believe he is sick. He is eating very little, lost a lot of weight and i breathing heavily or shaking i don't what it is. He is always tired and doesn't move around the cage a lot. When i am holding him he doesn't explore around my hand a lot. I have looked up sickness but i can find out what fits his symptoms as each symptom goes with lots of different sicknesses. I have wondered if he is dying as he is over 2yrs old. Been like this for a week now

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1 Answer

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Answered By Todd Cecil

Veterinarian

Published on February 18th, 2020

Thanks for reaching out about Peanut and including photos. Lethargy is just a general sign of multiple illnesses. A veterinary visit is recommended to assess and provide a diagnostic/treatment plan, even if just palliative. Offering water via a syringe could help combat dehydrate, and likewise, softened/wetted food could give calories. This sounds like a respiratory problem, whether infectious (bacterial, viral), metabolic or heart problems, needs to be determined. Good luck.

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