My household has 2 chows who have been with me one year. About a 2 months ago, my daughter's yorkie came to stay. The yorkie barks at the chows and is jealous. The chows normally ignore her but tonight the male attacked her and drew blood - very little though the yorkie is trembling. I am afraid to leave the yorkie alone with the chows now. I need some suggestions on what to do with them, if they need to be kept separate? The male has also attacked the female chow, not bleeding but a scary attack. At other times, the male is docile, and just wants to lick you. After the attack he ran under the bed. He does have a problem responding to commands.