Is there a way to keep two male mice from fighting Or is it nothing be concerned about?

It's not something to be unconcerned about. Male mice are highly territorial and will fight each other if they are housed together.

While it's possible to introduce them with careful planning and monitoring, it's not recommended for the average pet owner.

Here's why:

* Serious injuries: Fights can result in severe bites, wounds, and even death.

* Stress: Even if they don't fight, constant tension and aggression can severely impact their health and well-being.

* Difficulty: Successfully introducing two male mice requires specialized knowledge, patience, and resources, like a neutral territory, adequate space, and the ability to monitor them closely.

Instead of risking their safety, consider these alternatives:

* House them separately: Give each mouse its own cage, ensuring adequate space and enrichment.

* Adopt a female: Introduce a female mouse to one of the males. However, this can still be tricky as females can be territorial, and breeding is a possibility.

* Get a larger cage: If space is limited, consider a larger cage that allows them to have their own space, but potentially reduces aggression.

If you are determined to attempt an introduction, consult a veterinarian or experienced breeder. They can provide you with detailed advice on the process, including:

* Neutral territory: Introduce them in a completely neutral environment.

* Slow introduction: Allow them to sniff each other through a barrier initially, then gradually introduce them with close monitoring.

* Signs of aggression: Know the signs of aggression (hissing, fur ruffling, biting) and be prepared to separate them immediately if necessary.

Remember, your goal should be to ensure the health and well-being of your mice. It's best to err on the side of caution and avoid putting them in a situation that could lead to injury or stress.