What should I do if I buy a mouse and put it in the same cage as my other aggressive mouse?

Hi :)

I've been doing small animal rescue and worked with aggressive animals for a long time.

The first thing you need to do, before you even consider another cage mate for him - is work on his aggression. Just because a "pet store employee" determines it's aggressive - why are we taking their word as God's?

Does your mouse bite you? Has it bitten anyone else? It would seem to me if you need a supplement to keep him active - he was aggressive at the store because he was sick - the biggest reason small animals are aggressive in the first place.

If you decide that YOU don't think he's aggressive, you'll want to get another male. You'll need to introduce it over a period of days or even weeks.

You'll have to sterilize the entire cage and remove anything you can't get the first male's scent off of (treats, anything wooden, etc) and replace it before you introduce them.

It's not an easy process. You may be best off just trying to give your one mouse all the love you can - if he has YOUR love, he'll be ok. Take him out and let him explore your desk while you study, etc.

Whatever you do, don't get a female. Same species or not, he could still attack her and no matter what - you'll end up with pups - are you seriously ready with school involved to try and handle finding homes for zillions of baby mice?

Just think long and hard and follow your conscience. If you have any other questions, feel free to message me.

Daisy

On the contrary of what the answer above tells you, he will not harm a female of his species, but take her for a mate which is nice for both lonely parties, and when you come home you will have adorable baby mice. Mice are great pets, but they are aggressive, and males will fight to the death, most often, if they have not grown up together.

It is inhuman to put two males together for one will suffer terribly until it finally dies of injuries and hysterical terror stricken exhaustion. A trifle purple prosy there, but that's the way any kind hearted person should feel. My daughter put a male hamster in a cage with a strange male, and if I had not secretly let the weaker (younger and smaller) one out to shift for himself in a rather sterile apartment he would have died. I told my daughter to leave food and water out for him and wished him well.

If you have a aggressive mouse and put it in with another mouse they will fight and one will be killed or seriously injured.I suggest you don't buy another one unless you have another cage for it.If He is depressed then get another one!.But before you put them together allow them to meet before you do so.If they begin to fight take one out and be sure you do it before the fight starts.Get a female and have your male alternated ( Neutered ).

I would keep him in a separate cage, but have a tube going from 1 to other so that they wont have territorial issues but if still shows aggressiveness, show that ur the dominant one and they shouldn't be aggressive anymore. also spend alot of time with him, prop him on ur shoulder and watch a movie together.

obviously not a female,you would be better just leaving him,he might kill another one....

well,he would prolly end up killing another one,if your gonna get another,I would go with a male,prolly somewhat aggressive,if you get a lenient one,it will get picked on,but,he might still end up killing it,or they could be best friends...maybe one that is bigger than him,but one or the other could get hurt....

if you get a female you will have thousands of babies...(unless as the below answer suggest you neuter him)

obviously not a female,you would be better just leaving him,he might kill another one....

well,he would prolly end up killing another one,if your gonna get another,I would go with a male,prolly somewhat aggressive,if you get a lenient one,it will get picked on,but,he might still end up killing it,or they could be best friends...maybe one that is bigger than him,but one or the other could get hurt....

if you get a female you will have thousands of babies...(unless as the below answer suggest you neuter him)

wheredid she say it killed one anywhere in that stoy.

so how can it kil 'another'

I would not try and introduce two mice together.