I'd read about Yorkie's being ratters which is why I can never let him upstairs in our house. Dd has a hamster. He nearly lost his life with excitement when he once snuck upstairs when the hamster was in his ball. He also goes beserk when I bring the cage down to clean it. He growls and barks to try and sniff it. I've no doubt that he'd kill him in a flash if he got the chance.
I have to say that I like this side of Yorkies as it shows a talent. Albeit a blood-thirsty one.
