It is an Italian word having the same meaning in English and in Spanish. In English it is spelled with two l's. as allegro. In Spanish it is spelled with only one l as in alegro. To determine the meaning:
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1 Standards typically weigh about 24 pounds, and minis generally weigh about 10 pounds. Of course, the Chihuahua's small size figures into the mix, so you can expect a reasonably small dog overall.  Head - The head is typically small.