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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I can tell you what my dogs weigh, but that is because I know what weight they will most likely be when adults. A miniature is technically just a dachshund and what makes them a miniature is their adult weight at 12 months. Prior to that, they are just dachshunds.