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Mice/New Mouse


I had 2 female mice and I have had them for a while now and decided to get another. My new one is much younger and smaller but the pet shop staff said that was okay because they will most likely take care of it like it was a child. I introduced them in neutral territory, I used vanilla extract and cleaned everything and they weren't fighting in the neutral territory. Then when they were in the cage my dominant female chased the new one around. There were squeaks but it nipped her. I checked for bites and blood but there was nothing. It has been like 5 hours and no more of that behavior. The other one cares for it like its own daughter. I was just wondering if I would expect anymore when it looks like it stopped.

Hi Katie,

Hopefully it won't continue, but it would be a good idea to keep your eye on them for a couple of days just to be safe.  Chasing is normal, and while the nipping is a little worrisome, the fact that there were no injuries and the cage has calmed is an excellent sign!  Usually all the scuffling settles down within the first 1-2 days.

Best of luck, and congratulations on your new friend!


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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!

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