Roxy loves anything that moves. She will run up, put her head down on the ground, stick her little butt up in the air and go around in a circle, like a break dancer, then rolls over on her back for a belly rub. She has never growled or nipped at any living thing, except my 2 cats when I send her out to round them up and bring them inside for the night. She thinks they are afraid of her and they let her think that even tho they are both bigger than she is. But I have seen some pretty nasty, nippy dogs that I won't go near and their owners think they are well behaved.
