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
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
-
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
My dog was spayed on May 13 with no identifed complications. I have unneutered male in the house and he is behaving like she is in heat. What are the possible reasons for this
Hello! I have two dogs. a female with 6 years and a male puppy with 6 months. The female ended her heat about a month and a half but these past week she tried to hump the male puppy twice and he tried to hump her one time. Why is this happening? She
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
Why is my dog acting out now that she’s in heat? When I take her on walks and let her off leash she runs off and won’t come back sniffing things peeing she isn’t like this normally she has exellent recall I think it’s because she’s in heat but why???
My female dog just started humping today for the first time. She was spayed at 8 months old. Why might she be humping and can I do anything to stop her?
I spayed my female dog but why does my male dog think she is going on heat because he is behaviour is as if she is.
I've noticed my 7 month old female Chihuahua has started humping her male bestfriend everytime she's around him is this normal?
I recently adopted Gabbana & she got fixed a little over 2 weeks ago. I do have a unneautered male dog but it seems since she’s been fixed she’s been trying to hump him. Every time I turn around she’s mounting and trying to hump my male dog any chanc
My 3 yo desexed female Australian Cattle Dog has a recurring problem. Every 3-4 months she will try to escape and shows strange behaviour, rapid panting, pacing aimlessly, eyes darting. This last about 3 days then she returns to normal behaviour. Can
I got a 5 month old female puppy the beginning of Dec. she’s not fixed yet. Today I’ve notice Wallace (2) trying to mount her a lot. He is neutered. Should I spay her soon? Is that why he’s just suddenly starting doing it?
Book an appointment with the pros – our expert vets are here to help.
