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Why are my puppy's nipples swollen and bruised after her first heat?

Updated On September 23rd, 2025

Pet's info: Dog | Mixed Breed | Female | unspayed | 11 months and 6 days old

Hi my 11 month old puppy has just finished her first season. I've noticed her nipples are slightly swollen and veiny. They almost look bruised. Do you know what this could be?

2 Answers

Most Helpful Answer

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Answered By Dr. Massimo Orioles, DVM, Cert AVP, MRCVS

Veterinarian

Published on March 3rd, 2019

That could be a normal reaction of the mammary glands after the season, and it is likely to resolve spontaneously one or two weeks after the season. if signs persist more than that and discharge comes out from nipples a check up would ideal as false pregnancy or mammary gland inflammation/infection may be present.

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8Pet Parents found this answer helpful

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    Answered By Ann Dion, DVM

    Veterinarian

    Published on

    Hello and welcome to Petco Pet Education Center, formerly Petcoach. Often around the nipples will have increased blood flow during a heat, so they could look bruised. I recommend feeling the nipples and glands, if there is any pain, coldness, or heat present, then have Willow seen by a vet right away as concern for mastitis is possible (however this is not the correct time of cycle for mastitis). Otherwise, just monitor them and see if they go back to normal in a week or so. If they get any worse have Willow checked by a vet. Best of luck with Willow!

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    6Pet Parents found this answer helpful

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