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Research: 3 Signs To Note When A Dog Wags Its Tail

Dogs wag their tail to communicate with humans and other animals. Often, it seems fairly obvious what the dog is trying to tell you when he wags his tail.

Most people look at a dog with a wagging tail and assume he is happy. While this is usually true, there are times when a dog wags his tail right before he becomes aggressive. It is important that you pay attention to how the dog is holding his tail when he’s wagging it. Where the tail is and the way a dog holds his body while he’s wagging it can give you a clue about what he is trying to communicate. You should also pay attention to other signs in the dog’s body language.

Happy Tail Wagging

Is the dog’s tail relaxed and moving back and forth? Is his body moving along with the wagging? If a dog is wagging his tail and the rest of his body seems relaxed or is moving along with the wagging, you are probably dealing with a happy, comfortable dog. Happy, relaxed tail wagging is usually accompanied by a happy facial expression. A happy dog usually has bright eyes, a relaxed open mouth, and possibly a gentle pant.

 Fast tail wagging with other happy signals usually means the dog is excited.

Other Reasons for Tail Wagging

Is the dog’s tail high and moving in back and forth motion while the dog’s body remains fairly erect and rigid? If a dog is holding his body erect and rigid while wagging his tail, he may be telling you that he’s feeling territorial or uncomfortable with something that is going on around him.

 The tail may be low and wagging slowly, usually because the dog is hesitant about something. Or, the dog’s tail may be held high and moving back and forth narrowly but rapidly. This discomfort can be a precursor to aggression. This is one reason people sometimes report that a dog was wagging his tail right before he bit someone. So, if you encounter a dog you don’t know who is wagging his tail, check out what the rest of his body language is telling you before you approach. It’s better to be safe than to get bitten by a dog.

Left and Right Tail Wagging

Does it matter which direction a dog’s tail wags? One study shows it might matter when it comes to dog-to-dog communication. Researchers found that dogs had different emotional responses depending on whether another dog’s tail was wagging to the left or right. Dogs observing another dog wag to the right seemed to become relaxed. Dogs watching another dog with a left tail wag exhibited signs of nervousness, stress, or anxiety. This study shines some light on the way dogs interact with one another.

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