what to do?

I just don't see it worth the worry. I've had dog aggressive dogs before and have dealt with alot off of a dog and will be the first to say most dogs do what they do because of getting provoked whether biting humans or killing dogs.

A real catchdog is hard to come by no matter which way you slice it and some are harder to come by then a good Cur dog. There's no denying that, but I'd hate to come home and have a good Cur dog dead because of a collar breaking because things happen. I've seen some real good dogs killed my other dogs by accident. One that happened recently was the Cowboy dog from Clue Anderson's. If you asked him what he thought about it, I don't think he'd be to friendly towards the bulldogs.

I guess it's all in what you're able to put up with and live with.