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Hi tamarah we have just got two pet female mice at eight weeks old. We have had them for two days and Lucy keeps atacking Libby, taking her food off her and chasing her around the cage until Libby is back into her bed area.Is Lucy an aggressive mouse or will they settle?

Hi Linda,

It's still pretty early, so I would give them a little more time to settle down.  It sounds like they are just figuring out their pecking order.  The exception would be if you see any biting (you can blow the fur backwards on Libby to check for scabs or ouchies), tail rattling (buzzing the tail against something hard that signals the situation may go south), or boxing (defensively standing on back legs and "punching").  The last two are clues that they should be watched very, very carefully for violence.  Biting, however, or any kind of drawing blood is a sign they should be separated immediately.

The good news is chasing and bothering is totally normal for a new introduction, and there are things you can do to help.  Until they have calmed down, try removing the food bowl and scattering the food across the cage. This ensures Libby can get something to eat anywhere without Lucy guarding the food source.  Second, if you give them treats, be sure and only give each mouse one at the same time. Then they will argue less over who gets to enjoy the yummy stuff.  If they don't settle down, and Lucy is still chasing Libby everywhere in a few days, feel free to write me back and we'll see if we can't try some other techniques to get them to play nice.

Congratulations on your new pets!


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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

Partial University for a B.S. in Microbiology, Partial University for a 2-year degree in Veterinary Technology (RVT cert), C.E. classes in pathogens, aseptic technique, genetics, and applications

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