OK, well then no kittens for you! My last Rottweiler was not cat-safe; he killed three strays in my back yard over the years although he was fine with the ones he grew up with. As I've said, my Jack mix is awesome with them. My Lab is fairly horrified by kittens and cats, he's like ewww it's touching me and he walks away if one gets too close, but he is actually very gentle. Booker is extremely curious but he's at an age where he wants to put everything in his mouth; I am sure he would not knowingly harm one but he's such a big clumsy lout and anyway Fiona the Jack mix won't let him near them so it's a moot issue. Hopefully your neighbor's cat learned to stay away; outdoor cats are pretty vulnerable to many different threats. I do not hold it against a dog who wants to kill cats, I'd prefer it not so but really no different than cats who kill mice (or songbirds for that matter), or a dog who goes after skunks and other wild critters. It can be really hard to override instinct and prey drive!