This is my first time posting anything on the site but I have been reading everyone else's information and have found you all very helpful with training my 6 month old Sprocket. But I too have had this same question and more regarding breeding, size, age etc. We are getting a female named Katie next week and she is also 6 months old and 2ib 8oz my Sprocket is 3ibs 7oz. I'd want to wait at least till they are 1.5 years old before we start anything like that. Wow the price range is pretty incredible we paid $600 can. for Sprocket (not registered) and Katie is $1350. can.($1000 apx. U.S.)(she's registered with breeding rights) but we have to really look for them in Canada we have to drive 9 hours to pick her up! I've always loved Yorkies (my aunt had 2 ) and our dogs will also be pets and health first and puppies if I'm lucky