I have a Cairn Terrier, he weighs around 16lbs. Gracie (my yorkie, 2.2lbs) will NOT leave him alone. She bites on his tail, chews on his face, his ankles, his hair. I'm at a loss! Max will put up with it for quite some time, but when he's had enough, he'll put her down. I don't think he's hurting her, b/c she'll go right back to it. (The stern NO doesn't seem to work well) I don't want Gracie hurt, but I'm beginning to think she'll have to have the "P" knocked out of her before she gets it through her stubborn head!lol