We got our baby girl 2 weeks ago. She was supposed to be pure Chihuahua.
Her Mommy is a long haired Chihuahua and the supposed Daddy was a 3 1/2 lb. Chihuahua. Out of 5 babies our girl was the only short hair. At her last vet visit they noticed the other babies with long hair, was longer than a long haired Chihuahua. The vet said they were part Yorkie. There was a Yorkie male visiting and evidently a mating took place before the actual scheduled breeding a few days later. The Mommy delivered earlier than she was supposed to from the Chihuahua breeding. Since we have a Chihuahua and Yorkie mix, and I might add she is a beautiful black and tan, Rotti markings. Her name is Chiki, "pronounced Cheekee", for Chihuahua and Yorki.