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My puppy eats but is underweight. How can I help him gain weight?

Updated on September 23rd, 2025

Pet's info: Dog | Great Pyrenees | Male | 1 year old | 76 lbs

My Great Pyrenees is a year old and is underweight he eats but isn’t gaining weight. What could I do?

1 Answer

Most Helpful Answer

Dr. Andrea

Answered By Dr. Andrea

Veterinarian

Published on March 22nd, 2018

First, I would make sure you feed Dio a puppy food, not an adult food. Second, make sure you are feeding him enough cups of food. Third, make sure to feed a high quality large breed puppy food. A grain free brand like Merrick or Wellness or Taste of the Wild would be great. Even Science Diet Large Breed puppy would be ok.
Last, make sure your puppy has had a fecal test run to make sure he doesn’t have worms. A monthly heartworm prevention, like Heartgard or Interceptor, treats parasites too.
If your dog is still not gaining, they may need further testing or work up.
In addition, adding a probiotic may help as well. I like Animal Essentials Plant Enzymes and Probiotics.
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