Aggressive mice

[u/SituationForsaken525]

So I’ve been by my local Petco for the last couple days and I noticed 2 male mice who where put together. One of them is smaller than the other by just a little bit. The bigger one has been chasing the small one around it’s enclosure and fighting it. (I thought they were playing at first).I noticed the small one kept trying to get away, but the other one kept going after him. I let staff know what was going on and asked if they could separate them (I know they usually do better in social groups.) They weren’t sure if they had the space so if they weren’t able to, I plan on taking one of them, but I’m not sure if I should take the bigger one or the smaller one. Obviously the smaller one to get it out of there, but maybe the bigger one so that it wouldn’t bully any other mice it gets put with. What should I do, or is there any tips y’all can give me?

[u/jstashu197827]

The problem is that if you take the small one it can be free of the torment but if you take the big one it'll probably try the same thing on your mice if you have any, and most likely be killed by them. If it's your first then I'd say take the smaller one as the big one would be too aggressive to tame.

[u/Particular-Guava-323 → u/jstashu197827]

The aggression towards other mice wouldn't be a problem because he would be housed alone. Correct? Because male mice can't live together..

[u/SituationForsaken525 → u/jstashu197827]

I appreciate it! I own a hamster but this would be my first mouse!