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You must pay close attention to the dog and check for signs that they want to interact with you. A couple of these signs are tail wagging, attentiveness and an open mouth as they are "smiling" to you. If the dog is showing fear really be sure. Some signs that a dog may be concerned are: never ever tail is tucked in, if they turn their scalp away or are licking their lips, or these people have a closed mouth and are hiding behind their handler: these can all be signs of fear. When they are cowering, growling or shaking it might not function as the best time