If this puppy truly is one pound at 12 weeks, it is a very very small chi. I would guess it would top out at 3-3.5 pounds as an adult. Having said that .... do you know this is an accurate weight? I have seen people with pups weighing at least 3 pounds say they are one pound or even LESS.

Unless you have SEEN the puppy on an accurate scale then you don't really know. People's perception of size is all over the place.
Example... was walking Brody the other day. Met a lady with a chi twice his size. We were talking and she asked what he weighed. I said 5 pounds, maybe a little more. She gasped and said HER dog only weighed THREE POUNDS. I wish I'd taken a picture. Her dog was literally 10 pounds. It just was hilarious how she misinterpreted size, even when compared to another dog half her dogs size.
I have seen many unscupulous (or maybe just naiive) breeders trying to sell puppies and posting unrealistic weights of 1 pound at 12 weeks. It's really obvious the dog weighs much more than that and will be an average or even bigger sized chi as an adult. But people will do what they can to sell puppies. (Not saying your breeder was doing this - just an example - and if weight/size if really important to you, then ask for a picture of the puppy on a scale. And hope the breeder hasn't zeroed it out at a negative so the dog weighs less.. HA! I've seen it happen!!)
