Can My Leopard Gecko Eat Mice? or is it bad for them?

You need to Google your questions and do some research on how to care for one. Find out the minimum tank size, what bulbs and heaters they need, what food they eat etc. I'm sick of seeing people who have not done thorough research before getting a pet and are asking people on yahoo, half of them don't actually know how to care for one and still answer the question!

A variety of suitable gut loaded insects (roaches, silkworms, crickets, etc) should be the main bulk of the diet, but the OCCASIONAL pinkie mouse for a leo CAN part of a healthy varied diet (especially when talking about breeding females), but they should only be used as a treat as they are high in fat. If your leo accepts pinkies (many wont take dead prey) then by all means include them as a healthy treat for some extra protein/calcium/etc, but no more than once a month.

Yes, they can eat mice. Pinkie, or blind and hairless baby mice are small enough for them. Mice have bones, and the calcium in those bones will be good for them.

The best items to use are mealworms or crickets, but you can treat your pet to waxworms or superworms once a week if you wish. Avoid feeding leopard geckos pinky mice.

He won't touch a mouse. Geckos are insectivorous.