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Why is my female dog suddenly acting male, marking, and humping?

Updated on September 23rd, 2025

MY female dog is starting to behave like a male dog? I got my dog 5 months ago she is 3 years old this behaviour only started within the last few days she is marking her scent everytime she sniffs something and when I let her off leash she doesn’t want to come back she too busy marking her territory everywhere and she’s also humping my other female dog I’ve had her 5 months and she’s never done This before only been happening since the beginning of the week xx

2 Answers

Most Helpful Answer

Answered By Dr. Melanie, BVSc MS

Veterinarian

Published on April 16th, 2018

If your female dog isn't spayed, she could be coming into heat causing this behavior. Female dogs go into heat around every six months, and if you have had her for five months, it would be about time to go into heat again. This behavior will continue every six months unless you get her spayed, which I highly recommend getting done. Best of luck!

1Pet Parents found this answer helpful

Related Answers from Veterinarians

Answered By Rodrigo Roca, DVM
Veterinarian
Published on January 14th, 2020
Hello, sorry to hear about Cookie. If she is spayed, then I would be concerned that she may have a remnant ovarian tissue that needs to be completely removed. The remnant ovary may be continuing to produce sex hormones which is then causing her behavior. Alternatively, this could be a learned behavior that you will need to modify by deferring his behavior to doing something else.

I would discuss with your primary care veterinarian about checking hormones via a blood sample to confirm that she does not have remnant ovarian tissue. Cookie may also need an abdominal ultrasound to check for this. Hope this helps and best of luck.
1Pet Parents found this answer helpful

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