I typically stick to breeding AKC registered Chihuahuas because due to their policies, I know my Chihuahuas are purebred. In order for a Chihuahua to be AKC registered, both parents must be AKC registered. Whereas CKC will register a dog if you submit pictures of the dog and an application with two witnesses signing to verify the dog is purebred. I find it hard to believe that everyone submitting a CKC application has been completely honest. I also find it hard to believe that you can distinguish a purebred dog by simply looking at pictures. This does not mean that there is anything wrong with a CKC registered dog. They still make wonderful companions. Nor, am I saying CKC Chihuahuas should not be bred. CKC Chihuahuas should be representative of what a true Chihuahua is supposed to be like. You just can't assume that a CKC dog is purebred. As a Chihuahua breeder, I strive to do the best for my puppies and dogs. In doing so, I will never attempt to misrepresent a puppy to be something it is not. That is not fair to the puppy or its new owner.
According to the Chihuahua standard, Chihuahuas weigh anywhere from 2-6 pounds. The difference in size does not make them any different from each other. Breeders will often use words like teacup, mini, or glass slipper to mislead those looking for a smaller Chihuahua. There simply is no such thing. You can not always judge a puppy's full grown weight just by looking at the parents. Genetics are very complicted. When you are searching for a Chihuahua, ask yourself how much would you like your Chihuahua to weigh full grown. There is a very accurate chart (included on this website on my links page) that can estimate a Chihuahua's full grown weight. By asking the breeder how old the puppy is and what it currently weighs you can chart for yourself an estimated adult weight. Often times, the tinier Chihuahuas are predisposed for health issue that you should be aware of. Hypoglycemia is one of them. Because my smallest Chihuahua weights 3 pounds, I have not had a whole lot of experience with the health issues of smaller Chihuahuas. I am not a trained veterinarian and do not pretend to be. If you are considering purchasing a Chihuahua that is smaller than 2.5 pounds, I would consult a veterinarian as to the possible problems that might occur.