I have a male pitt bull. Should i get a male of female doberman?

Get your pit fixed, you're not a breeder, and it will make him happier, calmer and more loyal. Get a fixed male doberman, ONLY if your pit is socialized and likes to play with other high energy dogs, and doesn't have a dominance problem with male dogs. I'm not sure if you mean that you want a female doberman so he will stay on your property? So you want him to mate with the doberman? That is definitely a bad idea. The puppies will not be purebred; it's irresponsible.