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Dog in heat, now has swollen nipples & tight belly. Is she pregnant?

Updated On September 23rd, 2025

My dogs has been in heat for about a month and now she's acting super out of her normal and nipple swollen tummy tight and has always looked lean and does not anymore. Is that preg or just her first cycle?

1 Answer

Most Helpful Answer

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Answered By Dr. Melanie, BVSc MS

Veterinarian

Published on March 18th, 2017

A dog's heat last 3-4 weeks, and her nipples can become swollen during a heat. This should go down in in a few weeks. If your dog was around an intact male during her heat, it's certainly possible that she is pregnant. She also could be experiencing a false pregnancy. I would have her seen by a vet in another 3-4 weeks if she still has a swollen nipples and a tight belly. The vet then can diagnose if she is pregnant or not. Should she start showing any other signs such as vomiting, lethargy, anorexia, or diarrhea, I would have her seen by a vet right away.

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