My little Mac will b 2yrs on 8-7-08. He is one of the most handsome Yorkies I have ever seen! He has been the perfect little guy since the first night he came to live with us when he was nine weeks old. Potty training was a breeze, seldom barks, eats well, very smart..so smart, my husband thinks that not only does Mac understand English...he can read minds.(?)....and I think he is serious!

anyways.. We want a female Yorkie. My concern is that bringing another pet into the house will change Mac. Will he start marking his territory? He has never done that and is NOT neutered. He weighs 6lbs and what if he is aggressive to a tiny baby girl? Mac is very spoiled, like all yorkies should be.... He is used to our un-divided attention. Please give me advice on what to expect..