Chihuahua vs Yorkshire Terrier

Chihuahuas are genuinely fragile, with thin, easily broken leg bones and, in some dogs, a soft spot in the skull that can persist into adulthood, and despite the tiny, portable image they are one of the most surrendered breeds in American shelters, not a low-commitment accessory.

Their tiny size is itself a health liability, not just a look — Yorkies are prone to airway collapse, liver shunts and severe dental disease largely because they've been bred so small, and 'hypoallergenic' is marketing rather than biology: no dog breed, Yorkies included, is truly allergen-free.