Greetings ALL !
Though new to this Board, I have had the privilege of providing for numerous K9 Companions for many years, and I AM proud to say that I now have another.
Goofie came to us in November of last year (at 6 wks), and immediately possessed our Hearts, Property, House and the Furniture in it !!
What can I say...he's a Terrier, Yorkshire to be specific !
I've looked through a lot of information on Yorkies, and all of it says they should top out at about 5-7 lbs. Goofie hit that in about 3 months, is about 10.5 lbs now, and he's only about two weeks from his first birthday. I'll tell you promptly, he is very trim and strong, and is not an overeater or overweight in appearance.
Is this common for a Yorkie, do they occasionally/regularly get large as he is doing ?
Have a good Day ! 
S.W.