[Answer] 3. This dog breed originated in Mexico, and is also the smallest dog breed.

Step 1 : Introduction to the question "3. This dog breed originated in Mexico, and is also the smallest dog breed."

...1. Yorkshire terrier 2. Maltese 3. Chihuahua 4. Boston terrier The only dog that originated in Mexico out of the four is the Chihuahua. They typically weigh 3-6 pounds. They come in long-haired and short-haired varieties.

Step 2 : Answer to the question "3. This dog breed originated in Mexico, and is also the smallest dog breed."

Chihuahua:

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