Why does dog's hair stand up on their back?

Why does dog's hair stand up on their back?

Many pet parents notice that their dog’s hair stands up on their back when they are in the dog park, and are pretty confused by this behavior. What does this mean? Why does my dog’s hair stand up on their back? Is it a sign of aggression? Well, this is a phenomenon called piloerection and has a perfectly reasonable explanation. And no, it’s not always a sign of aggression.  What is piloerection?  First things first, we have to understand the true meaning of this behavior in order to comprehend its motives. Dogs’ hackles are the hairs that cover their whole back and go all the way from the neck to the beginning of their tail. When you see that your dog’s hair stands up on their back, what's actually happening is that their hackle is being raised. This behavior, also.
Many pet parents notice that their dog’s hair stands up on their back when they are in the dog park, and are pretty confused by

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Why does dog's hair stand up on their back?

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