i have a cat and a yorkie and two yorkie poos, they all seem to get along well, except when the cat gets into one of his "attitude" phases..LOL.
He does at times smack at the dogs, but most of the time, he ignores them.
I have one that he actually will lick, like he's grooming her...and that i found strange considering he is a male cat, normally that is found with females...
I guess you will just have to see how your yorkies will react with the cat.
good luck!~
