lake Someone shot my cat with a pellet gun and I need some law advice?

We're pretty sure our cat, Mittens, was shot with a pellet gun. He is at the vet now, and they aren't sure but they're going to examine him later today. We are fairly sure who did it, as he is the only one near us where Mittens would go. A few years ago, my neighbors cat Feebee was also caught in one of his animal traps and had to have her leg amputated. I need to know if formal charges can be brought against this man and what the procedure is for prosecuting him. Thank you :)there