Why Do Dogs Chase Their Tails?

As with most dog behaviors, there are several possible explanations as to why a dog might chase their tail. An interesting phenomenon that is great fun to watch, it is most likely that your pooch chases his tail as a part of his normal “play” routine, to stave off boredom, or to provide himself with a little additional grooming.

Source: https://www.petfriendlyhouse.com/