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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A rule of thumb says a dog is obese if it weighs 15% above its optimal weight. For example a male German Shepherd, with a normal weight around 85 pounds (if the German Shepherd is physically active), is defined as obese if it weighs above 98 pounds. How Do I Found Out If My Dog Is Overweight?