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Mice/bullying mouse


I have two mice, a female and a male. I got the female two years ago and the male a year ago. Whenever i have them in the same cage, the male will attack the female and he pulls out her fur. Why?

Hi Kayleigh,

Some mice just do not get along - there isn't always a reason.  Especially with males, some are overly enthusiastic when trying to pursue females and can seriously injure them.  Whenever you witness actual aggression like this it is a good idea to separate them immediately and not risk it again.  Even if you had two females who were behaving this violently, I would still advise against putting them together.  It just isn't worth potentially losing one of your pets.

Additionally, it's important to remember that female mice go into estrus very frequently (approximately once every five days), during which it is possible for her to become pregnant.  At an age of at least two years old, this would be very unsafe for the female and could have lethal complications.  I would really, really recommend keeping them separate from now on.

If I can help you with anything else, please let me know,


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I can answer questions regarding mice as pets, mouse behavior, color and coat genetics, breeding techniques, and general health questions. I can help with caging and setup, nutrition, social issues, and what to do in most mouse emergencies (such as unplanned litters, injuries, fighting, etc.). I can also assist with questions pertaining to orphaned mouse pups, weaning litters, and questions of mating and birthing. I cannot answer questions about exotic or wild varieties of mice such as spiny or pygmy mice. *****FOR EMERGENCIES, anything requiring immediate medical intervention, PLEASE take your mouse to a professional veterinarian or wildlife rehabilitator who works with mice as soon as possible! IMPORTANT RESOURCES: Raising Orphaned Mice: Orphaned Mice Videos: Natasha's Your First Mouse: General Mouse Help: Mouse Info and Exotic Breeds:


I have enjoyed the companionship of mice nonstop since 2004, and spent a year caring for them in a lab where I learned a great deal about their breeding, social needs, and health. I spent a few years breeding them, specifically working with albinos, marked mice, angora mice, and satins. My education never stopped - I am learning something new every day from current and well-established research thanks to the wonderful folks at the Jackson Laboratory, as well as from my wonderful mousey friends online. I also love learning from my terrific questioners here on AllExperts - you folks keep my passion for these amazing animals alive and well!

East Coast Mouse Association - expired, American Fancy Rat and Mouse Association - expired

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