I agree that a Teacup is just the runt of the litter. But I'll also answer your question. A teacup is a term used for a Chi under 4lb.

Unpasteurized goat's milk is the easiest thing for them to digest. They should only get it if you are having trouble getting them to eat or are feeding a motherless puppy.
They should only be eating dry dog food with an occasional treat.

Some hobby breeders call dogs with incorrect heads "deer head". They might have short legs, they might not. They might have been inbred with MinPins since they should have short legs.
AKC describes a Chihuahua head as 'A well rounded "apple dome" skull'

Only if you want to pass on an underbite to the pups

Not all vets specialize in toy breeds. I've had Chihuahuas for 20yrs and we do a slow wean from 7-8wks. Listen to what your vet tells you, then do your own research and get a second and third opinion. Chihuahua puppies shouldn't be sold until they are at least 10wks. The only reason to wean … Read more