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Why isn't my Labrador puppy growing? Is his small size normal?

Updated On September 23rd, 2025

Pet's info: Dog | Labrador Retriever | Male | unneutered | 4 months and 16 days old

Hi, why is my lab not growing in size !? His parents are tall and have strong builds, max is smallest amongst the litter even tho the breeder said he's the pick of the litter. He's literally the same size when we brought him in 3 months ago. His weight is 15kg. You can compare the builds(pic below) of his father and him. I feed him exactly like the vet suggested. He has no sign or worms as well. When will he grow big and strong like I know he's still a pup but i literally observe no difference!?

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2 Answers

Most Helpful Answer

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Answered By Dr. Davis

Veterinarian

Published on September 7th, 2017

Puppies grow at different rates and even though the parents are large and stocky not every pup may get their build. Make sure you are giving Max a good quality food and that you are feeding enough at each meal. If he's very hungry and eats all the food quickly then you're probably not feeding enough at each meal. I feed twice a day and give a biscuit or two for treats. Controlled exercise daily will build muscle and swimming is a great exercise also. Max will reach his full size by the time he is two years old, perhaps slower than the others. He's a handsome boy and is just at an awkward stage right now. In addition please have a stool sample checked by your veterinarian to be sure there are no parasites effecting his growth. Thanks for using Petco Pet Education Center, formerly Petcoach to help you care for Max.

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    Answered By Dr. Macartney, BVet Med, MRCVS

    Veterinarian

    Published on August 17th, 2017

    Like people, dogs can grow at different rates and experience growth spurts. I would expect Max to be of a similar size and build as his father. To help ensure he has adequate nutrition to grow double check the feeding guidelines in his dog food. I would also consider adding extra protein to his regular puppy food diet. Boneless boiled chicken breast and extra lean beef can both be good additions and used as treats.

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