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My dog's mammary gland is swollen after heat. How long does it last?

Updated On September 23rd, 2025

Pet's info: Dog | Mixed Breed | Female | spayed | 8 years and 5 months old | 4 lbs

She recently just got out of heat but had swelling around one of her mammary glands. You can only feel it when you rub across it but when you kinda squeeze to inspect it or feel for lumps it feels normally. It seems to be shrinking & I took her to the vet 2 times & they both said it's most likely hormonal & they didn't feel anything bad. How long should it take for it to go down? Is my description how mammary swelling feels? I'm going to get her spayed in September.

1 Answer

Most Helpful Answer

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Answered By Lauren Kennedy, DVM

Veterinarian

Published on July 7th, 2017

This swelling is probably a hormonal response to being in heat. As long as she still has hormones in her system the swelling will remain. Since your vet did not feel like it was anything significant, it is probably fine. It will eventually go away on its own and if not it will certainly go away when you spay her. If you feel like the swelling is getting larger or starts to feel firm or painful than I would be concerned. Otherwise it is just a side effect of her being in heat.

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