Like the unicorn, the size 'teacup' is a mythical beast. While Chihuahuas & Pomeranians themselves do exist and they are the smallest of all the dog breeds there really is no such thing as a "teacup". Teacup is a name that has been coined so that unscrupulous breeders can convince potential buyers that their teacups are different from others and therefore are worth more.
Within the breed, there is a great variation of size, just like any other breed of dog and for that matter humans. There are smaller Chihuahuas & Pomeranians and larger, but there are no "teacup". Within a litter even, the sizes of individuals when adult can vary considerably from the very small to the very large, so even viewing the parents will not necessarily give an indication of the eventual size of a young pup.
When puppies are 8 weeks old, of course they are very small, but they grow and at 8 weeks, no one can tell you what size they will eventually grow to.
Most photos of "Teacups" are very young pups that will actually fit into a tea-cup. They will not stay this size.
Very small pups are possibly that size because of health problems, others though, live long healthy lives. Many of these health problems may not be recognised until the dog is older. It is the ones with health problems that can cause distress to new owners, when they either die at a very early age or become a financial burden requiring constant veterinary care. Potential buyers need to be aware of health issues such a hydrocephalus, luxating patella’s or heart problems.
If you really want a very small puppy, you are best to leave buying one until it is at least 4 months old and then even 6 months is better or older. At this time it should be clear as to their size and health status. But this is still no guarantee…
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