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Why is my puppy's side swollen, hard, and making him whiny?

Updated On September 23rd, 2025

Pet's info: Dog | Cocker Spaniel | Male | 3 months and 25 days old

Hi my 17 week old puppy Oscar is swollen on one side and hard, he is being more whiny than usual but has been going to the toilet fine

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Answered By Jessica Desrosiers

Veterinary Technician

Published on February 23rd, 2019

Ouch! Swollen bellies in puppies can be caused by a number of things including allergies, parasites, GI upset, or even something that is causing swelling of the skin or abdomen, or issues with the chest or internal organs. If the swelling continues, it would be best to bring Oscar to the vet to have the area evaluated and treated as needed. If it is causing any discomfort or symptoms such as diarrhea, vomiting, pain on touch, changes in shape or size, problems breathing, lethargy, etc, then seeking care sooner is best.

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