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My senior dog lost weight fast and won't eat his food. What's wrong?

Updated On September 23rd, 2025

Pet's info: Dog | Silky Terrier | Male | unneutered | 12 lbs

My dog who is 16 years old has lost a lot of weight, about 10%, but only in 2 days. He also has become really picky, only eating about a few bites of his first meal (he normally eats two meals). But is I feed some he would love, like chicken or some meat off the humans table, he would gladly eat it. Has he just become picky? Also there are no other showing symptoms, and his water intake is normal.

1 Answer

Most Helpful Answer

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Answered By Dr. Melanie, BVSc MS

Veterinarian

Published on August 6th, 2017

It is very concerning that Duni has lost that much weight in such a short period of time. It may not be that he's picky, he could have a medical illness causing his weight loss. These medical problems include dental problems, kidney failure, diabetes, liver failure, cardiac problems, or even cancer among others. Dogs can be very stoic when sick, and oftentimes they are quite ill before showing any signs. I would recommend that Duni sees a vet first thing Monday for a physical exam, geriatric blood panel, urinalysis, and chest x-rays to diagnose if there is a medical illness causing his weight loss and reluctance to eat. If one is found, the vet can discuss treatment options with you. I hope this helps!

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