It's commonly believed that dogs wag their tails to convey that they are happy and friendly.
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angieloumayramos898
Dogs will wag their tail to convey a range of emotions: happiness, nervousness, feeling threatened, anxiety, submission and excitement. It's thought that when a dog is relaxed, its tail will sit in a resting position. ... Dogs that are alert or excited will hold their tail higher than the natural position.
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It's commonly believed that dogs wag their tails to convey that they are happy and friendly.