Petco Text Logo
Petco Pet Logo
  • Two Easy Ways to Start Earning Rewards!

    rewards header
    Become a member today!
    Members-only pricing and offers, personalized care notifications, Vital Care points back on every purchase and more!
    Petco Pay LogoBecome a credit card member today!

    Earn 2X Pals Rewards points at Petco
    when you use Petco Pay!

    APPLY NOW
    Learn More About Petco Pay Benefits

Why did my overweight cat gain weight on a vet-prescribed diet?

Updated on September 23rd, 2025

Pet's info: Cat | Mixed Breed | Male | neutered | 5 years and 1 month old | 22 lbs

I am fostering an over weight cat for an animal shelter. He has been put on a special diet by a vet. He started the diet 2 weeks ago, weighing 20.4 lbs. I took him for his first weigh-in yesterday and he has actually GAINED 2 pounds. How can that be? The diet he is on is 3/8 cup Science Diet metabolic diet dry food plus 7/8 of a can of Science Diet metabolic diet canned food. That's his total food intake for the day.

1 Answer

Most Helpful Answer

Angel Alvarado, LVT

Answered By Angel Alvarado, LVT

Licensed Veterinary Technician

Published on February 14th, 2017

If he gained, he's still taking in more calories than he is expending. Discuss decreasing amounts fed with your veterinarian. Adjust the diet accordingly.
Increase Oscar's activity if possible. This can be done through interactive play and toys.
Vote Icon1Pet Parents found this answer helpful

Smart Picks for Smart Questions

Have A Vet Question?

Book an appointment with the pros – our expert vets are here to help.

Share

Styled arrow button