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Mice/adding a mouse


my pet mouse died because she got sick and my other mouse ate her. can i add a mouse to the cage without them fighting?

Hi Michaela,

I am sorry to hear about your loss.  However, as strange as it may be, even though your surviving girl ate the remains, she is grieving as well.  It is a good idea to give her a little time and some extra one-on-one bonding before introducing a new friend.  This will also give you a chance to make sure she does not get sick as well, particularly because stress is very tough on a mouse's immune system.

Another thing to consider is isolating any new friends you do bring home.  Mice frequently bring home illnesses from the pet shop just by accident - it is easy for them pick it up in the store and not show signs until after coming home.  For this reason, and to protect your surviving pept, it is a good idea to give a new mouse about 2-3 weeks of their own cage in a different room before introducing them.  It also gives you a  chance to see her real personality before putting her in with your current pet.

I cannot predict if they will get along - all mice are different.  Some are very social and friendly, whereas some prefer to be alone.  You will have to supervise any introductions and keep an eye on them for the first couple of days.  Some scuffling is natural and expected, but biting, boxing ( standing on hind legs and punching outward), or tail rattling (a threatened, buzzing of the tail against a hard object) are signs they need to be separated for safety.



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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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