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This dog has a stiff raised tail, its eyes are glaring and his body is tense and learning forward. Is he aggressive?
In this case, the dog is very likely aggressive. An aggressive dog has his ears tilted forward or flattened back against his head. His eyes are narrowed or challenging, his is body tense, and he is bearing his teeth. His tail is held out stiffly from his body. He may also be snarling or growling.