This type of dogs are called "Chihuahua"
This is the fourth type of Dog.
Chihuahuas are originate from Mexico, mostly about 3.3-6.6 lbs, and their life span is about 10-18 years.Chihuahuas are the ideal lovable, loyal and long-term pal. When you're alone in the house with a Chihuahua, you're never alone -- they sleep on your lap, sit by your side, or follow you from room to room while you do chores. When you're not home, they protect it like their personal domain, barking at the sign of any approaching stranger (making them surprisingly effective watchdogs). This endearing love and devotion.
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