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Why does my unneutered male dog act like my spayed female is in heat?

Updated On September 23rd, 2025

Why does my 3 1/2 year old unnuetered male bulldog keep acting towards my 8 1/2 year old spayed for 8 years female Bulldog like she's in heat? He keeps trying to mount her, he keeps sniffing her private parts, he's very insistent and dominant towards her lately and he just keeps acting like she's in heat and it's getting really hard to keep him off of her. He actually hurt her leg once trying to hold her down to mount her.

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Answered By Debi Matlack

Veterinary Technician

Published on November 8th, 2020

Since he is unneutered he may be picking up on her scent even if she is spayed, it's also a way to show dominance over other dogs. If you don't plan to breed him I suggest getting him neutered. This will help the behavior lessen over time and will also prevent some potential health problems as well as reduce the urge to roam and possibly get injured if he escapes looking for a female in heat. You can try getting him obedience training so he will be better behaved and more likely to listen when you try to separate them.

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