My Daisy is almost a year old. She's very sweet and social but I also assume she's blind. She has the ruby eyes and sways a lot to see what is happening. A few months back she bit my boyfriends sons finger to the point his fingernail eventually fell off. Well since then we don't really let anyone play with them. For their safety and the girls safety. It's easier if just my boyfriend and I handle them. My boyfriends mother came in and she will let them smell her hand while they are running around on the bed. Daisy is usually pretty good, will nibble but doesn't bite. Today she starting biting her like she was corn on the cob. Sank her top teeth in like she did with Jay. Is it because she doesn't recognize her? She never bites us. Will nibble our toes but even if I eat, she will just lick the food off my fingers. Never bites me. I'm just concerned and don't want anyone touching her. She can do some real damage. Any ideas?