But I don't believe it is a breed thing. I believe you were unfortunate to have happened to get a pitbull who did this. If your dog hadn't been raised with the cat I would say well that is just a dog being a dog but to be raised together and get along that is weird. But there are other dogs who are capable of attacking. I had a stray mix breed medium size dog. It didn't have any pit in it. I saw it kill a cat in my mother's yard. Brutally killed it. But it wasn't a mean dog to us. It also would try to attack our bealge pups. So I know other dogs are capable of killing animals. The pitbull can do more damage though than most dogs. But I have seen pictures of lab attacks on owners, Dalmation attacks on a child, many others. Any dog can do this. Personally I have a neighbor who had a little chihuahua and it was there little doll. They adored this little dog. Well someone who lives a mile to a mile and a half down the road has a Dalmation. It climbed the fence in its yard and went a mile or more down the road where the little chihuahua was outside peeing and mauled it to death with its owners watching. I mean they said the dalmation just attacked when it seen the little dog no provacation. So I know what other dogs can do too. But most won't. I hope you never have this problem again with any of your dogs. You had a most unfortunate incident with your pitbull and I believe this has rightfully left a bad taste in your mouth for the breed. But try to think of it like this. There are good people and bad people. There are good dogs and bad dogs. We have serial killers and rapists but we also have good people out there. Dogs are not different. Don't look down on the whole breed because of one bad experience. There are so many kind pits out there who have never hurt a living thing. Really.