We have a 7 yo Ridgeback who is very sweet and gentle but gets over-excited when she sees cats.
She is a big wuss and I have seen her run away whimpering when confronted by dd's friend's cat who is hard as nails.
I don't think she would bite the head off a kitten but she might terrify it! Would we be better off getting an older cat who needed re-homing and was used to dogs?