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Why are my nursing dog's mammary glands firm, if not mastitis?

Updated On September 23rd, 2025

Pet's info: Dog | Mixed Breed Medium (23 - 60lb) | Female | unspayed | 24 lbs

My nursing dogs breasts farthest back are a bit firmer than they have been. Is there anything that can be the cause of this other than mastitis? I have hear a lot about it and i'm just really hoping she doesn't have it. Any help would be greatly appreciated

1 Answer

Most Helpful Answer

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Answered By Dr. Melanie, BVSc MS

Veterinarian

Published on February 14th, 2018

In a nursing dog, mastitis is a very common and could be the likely cause of her firm mammary glands. In dogs who aren't spayed, mammary tumors are also common, and that could be another cause of the firm tissue. Given that Ladybuy is nursing, however, mastitis would be my first thought. Without seeing her in person, I can't say for certain, and I do recommend a trip to the vet first thing in the morning. As I'm sure you have read, mastitis is very serious and is fatal without treatment. She needs to be checked out to be sure she doesn't have it. Take her puppies with you to the vet. If she starts vomiting, develops a fever, stops eating, or her mammary glands feel very hot to the touch or become red, rush her into an ER vet right away. Good luck, I hope this helps!

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