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My unspayed female dog has crusty, leaking nipples. What's wrong?

Updated On September 23rd, 2025

Pet's info: Dog | Border Collie | Female | unspayed | 3 years old

I was just stroking my 3-year-old female unspayed border collie when I noticed the fur around two of her nipples had a yellowy/white crust around it. I cleaned it off but then found that one of her nipples was leaking. What could this be and do I need to make an appointment with her vet?

3 Answers

Most Helpful Answer

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Answered By Ann Dion, DVM

Veterinarian

Published on April 2nd, 2017

Hello. If she recently had her heat (about 1 month ago) then she chould be having psuedopregnancy. This is not a concern unless she develops a mastitis. If the nipples and glands are soft, not hot or cold, and not sore to touch, and if the milk is white and not clear, yellow, green, or has a bad smell, then you can monitor her. If you are noticing any yellow/green/clear discharge from the nipples then you need to get her to a vet ASAP. Prevent this in the future by having her spayed. Good luck with your little girl.

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    Answered By Laura Johnson VMD

    Veterinarian

    Published on January 6th, 2018

    Hi, thanks for using Petco Pet Education Center, formerly Petcoach! Poor Boo! If Boo had a heat recently she could be experiencing a false pregnancy. This is when there is a hormonal imbalance and her body THINKS she is pregnant when she isn't. The mammary glands can become enlarged and produce milk, they can act anxious, needy or nest and carry toys around like babies. If she is having a false pregnancy she can get an infection in her mammary gland (mastitis). Other possibilities are tumors that are inflamed and infected in her mammary glands. Because the skin in red and the glands are leaking fluid, sore, red and are swollen I recommend having your Vet take a look and see is she needs antibiotics. They can also tell if she has masses in her breasts. I hope this helps and I wish Boo the very best!

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    Answered By Linda G, MS, DVM

    Veterinarian

    Published on January 31st, 2019

    Hello. If this is a false pregnancy, there really is nothing much you can do at home. Unless you are going to use her for breeding, spaying will prevent this from happening again, but if you do not want to spay her, this will not cause any loss in fertility if you decide to breed her in the future. If her symptoms are mild, it is best not to do anything at all, as any stimulation of the nipples by applying warm compresses or wrapping them to prevent milk leakage will just stimulate more swelling & milk production. If she is licking herself, you may need to put a cone or E collar on her. If she really seems to be uncomfortable or there is a lot of leakage, sometimes we will treat these dogs with diuretics or even hormones. So, see how she does & see your vet if the situation worsens. Thanks for using Petco Pet Education Center, formerly Petcoach.

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