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My cat lost a lot of weight quickly but acts normal. Should I be concerned?

Updated On September 23rd, 2025

Pet's info: Cat | Chantilly-Tiffany | Male | neutered | 14.3 lbs

My cat lost 3.6 lbs in the past month which I feel like is a lot. He went from 17.8 lbs (October 8th) to 14.2 lbs (November 1st). He weighed 16 lbs at his annual vet check in May 2019. This is the lowest he has weighed since January 2018, the previous vet check (13 lbs). He's acting normal, pooping normal, he scores an 8 on the body scale so he's chunky. I'm worried about the sudden weight loss. I reduced his AM feeding amount but only the day before weighing him this month.

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1 Answer

Most Helpful Answer

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Answered By Daniel Fonza, DVM

Veterinarian

Published on November 4th, 2019

Hi there and thank you for using Petco Pet Education Center, formerly Petcoach to address your concern. There is a lot that we cannot tell from an examination on a pet, especially if it is something like sudden weight loss but the pet is otherwise acting normal. I would recommend having Kini's blood tested to evaluate overall systemic functions and see if there is an explanation for the weight loss. Check thyroid level as well. If all is normal on blood but the weight continues to fall, I would recommend x-rays and an abdominal ultrasound. I hope this helps! Please let me know if you have any other questions or concerns and I would be more than happy to help you further.

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