I have what I would consider a very, very large chi. He was 12 lbs. at about 9 mos. when I last had him to the vet getting neutered. I don't think he's grown much since then. He's now 11 mos. He weighed about 4 lbs. at 10 wks. when I got him. He's not registered. Parents came from a pet shop and are supposedly registered. But, from a pet shop you never know for sure. He looks like a pure-bred, deer head type. But, like I said from a pet shop, even registered, you can never be sure unless you get one from a reputable breeder.