What would you want to happen?
There's a thread going in The Doghouse where a dog (Lurcher) killed a cat. The dog was in a (seemingly) empty field, and a cat jumped out at the dog from a clump of long grass, the dogs instinct took over and it attacked the cat which died later on in the vets.
A few cat owners have posted saying they thought the dog should be PTS as it was now a possible danger to small children. But cats kill things all the time, birds/small rodents/rabbits etc, I'm pretty sure they don't care whether they're pets or not. You wouldn't have your cat PTS because it did what cats do. So why should this dog (or any dog that kills a cat in this way) be PTS because it did what dogs do, ie, reacted instinctively?
I'd love to know what other cat owners think. I don't have a cat, I do have a dog though, a greyhound with very high prey drive, ironically enough :o