Heya, get a ROttweiler, a American Stafford or a Pitbull.
When you get it at the Animal Shelter make sure YOU get the dog not the employee then the dog thinks you saved him and he'll like you a little already...
Get Pitbul , little risky, but the thrill is worth it ! my nabhers had few b4 they got away and killed like 4 cats and 5 dogs then they got cought and was killed by owners