I have a 19.5 pound yorkie (yes, I have his papers) and I get this all the time. Especially since he was born in Europe and didn't have his tail docked.
I have TWO yorkies, one is 5 pounds and one is 19 and they are both personality personified.
Have a stock answer ready for these twits who want to tell YOU what YOUR dog is (like, "well, the uninformed often confuse the two. Natural variation is a wonderful thing and I love his uniqueness")
Good luck.
Kate |