Genetics
Arte's Teacups
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Genetics
This link will provide you with several examples of genotyping.  These charts are some of the best and easiest to read since the ones I use to have to study in my biology classes.

This breeder has had some of the best looking Chihuahuas in this part of the United States.  Her dogs are absolutely gorgeous.  Plus she has invaluable years of experience in breeding as well as showing.



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Aidan
(Littermate to Wartenas Wind Me Up Tyco Toy and half-brother to Che)
Aidan has the same underbite just as Che.  But Tyco's bite is open.  In either case all three have poor bites.  All three had the same father.
You can see Aidan's underbite from the above front and the side view at the right.  While he is a very substandard Chihuahua, he has a great personality and can be a lot of fun when playing fetch or chase the dog.  Hopefully, Aidan will not have the serious periodontal disorders that his half-brother, Che, has.  This is one of many reasons why you need to make sure your breeder knows what they are breeding because this condition is a hereditary genetic disorder.