I'm sorry that this happened. My dogs killed one of my own cats this spring--Dominique in my siggy. It has been one of the worst experiences of my life. But the dogs aren't to blame. They were just being dogs. Dominique was where she shouldn't have been and I somehow let her get there. Her death is my fault. My dogs are like Tikeya, just fine with indoor cats, deadly with outdoor cats. Dominique had somehow got outside.

There's no point punishing him. He has no idea he did anything wrong. I'd keep him on a leash, especially when off your property. I'm not sure about the laws in your area, but where I live my dogs could be declared "dangerous" for going after a cat if they were off my property. Keep an extra close eye on him with your own cats as well. My dogs knew Dom very well, but when she was in a different spot, they couldn't tell who she was or that they weren't allowed to chase her.

Again, I am sorry. Godspeed little kitty.