The Chihuahua is a small breed of dog, which can be any size up toaccording to the written standard and quite often individuals will exceed this amount and Love Chihuahua St Patricks Day Green Shamrock T-Shirt. Chihuahuas are not recognized as any more than either a Long Coat or Smooth Coat Chihuahua. A Chihuahua is very small, but will never fit inside a regular size tea cup. Within the breed, there is a significant variation of size just like many other breeds.