Mixed breed litters are never consistent. There mght be a typical look that is more prevalent with a certain mix, but I work in a grooming salon/dog boutique and see these "designer dog" mixes all the time. We have several dogs of the same mix that come in and they all look different from each other. I have nothing against mixed breed dogs, and I think a lot of them are adorable, but I think it is very wrong to breed mixed breed dogs. When you breed purebred dogs, you should breed to improve the breed in some way and to breed for a purpose. With mixes there is not a standard to breed to and there is no improving the breed because it's a mix and not a breed. There is no purpose in breeding mixed breed dogs other than to contribute to the pet overpopulation. People that breed these mixes aren't breeding for a reason - they are breeding them because these dogs are popular and they can make money of of them right now. I hate this whole "designer dog" fad honestly and don't like the names people come up with for them. I think people should call them what they are. If someone wants a mix, they should adopt from a rescue or the shelter because so many of these "designer dogs" are ending up in shelters.
You can see that each chihuahua/yorkie mix looks different:
3 different dogs' pictures
http://www.dogbreedinfo.com/chorkie.htm
More pics
http://pets.webshots.com/photo/24042...84299948LtHIme http://good-times.webshots.com/photo...93857808CHHdYW http://pets.webshots.com/photo/24484...84299948PJnlFK http://good-times.webshots.com/photo...00906796vXWGhm
As you can see, there is a wide range of looks
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~Magnifique Yorkies~
Purchasing from backyard breeders, pet shops, and puppymills perpetuates the suffering of other dogs.
Educate yourself and buy from reputable breeders or rescue.