8 month old male blue Merle pit bull

Gorgeous 8 month old blue Merle pit bull, not neutered.. will make for a great stud! Knows how to sit, lay down, paw. still pulls during walks, but I'm sure it's because he's an unaltered young male. does not come with papers, but sure it won't be hard to get them. I have rabbits and a cat that he is very interested in eating, and I don't know how to train that out of him. He barks when he's supposed to, runs up on any dog no matter what, if he's off of the leash.. I'm not allowed to have his breed going into my next apartment so I have to get rid of him. Blue Merle Pit bulls range in the upwards of $20k per pup.  I would say he's probably about 50lbs, good with people but will bark. Grey and tan brown coloring, super funny playful pup, but also will protect. had had 2 sets of vaccines.