We have 2 Border Collies, brother & sister. They love to "herd" each other all the tiime. We recently aquired 2 kittens about 6 weeks old, our Collies think they're the kitties parents and have started herding them. The only thing that freaks our female out is when one of the kittens finds a nipple and tries to nurse. She has never had nor will have puppies, so this part she doesn't like! Lol