I have been blessed as well! Oliver being my first Yorkie was so good as a pup! And still is....he has the most passive attitude. Everywhere we go someone falls in love with him! Including his surgeon and all the nurses and staff at the hospital where he recently had his patella surgery. Brooklyn has been a bit more of a challenge because she is not as passive and I worry more about her getting herself into trouble because of it. She is very sweet, but, if challenged i worry she will not back down! Now, my new little Maltese, Benjamin, if he were any better behaved he would have to be in some hall of fame or something!! No kidding, he is the best, easiest, puppy i have ever dealt with!! I keep waiting for him to turn demon or something!! Could i be this lucky!!!
So to answer your question...i would have to say "no" ....for me Yorkies are not really challenging!