Why do you think dogs chase their tail?

Because the tail stole their 50 bucks.

Cause it keeps moving further away - same reason we seek the pot of gold at the end of the rainbow I reckon

Because dogs nose are very special sensitive of the smell

Dogs chase their tail, because of Instincts,habit and a release from boredom, and maybe to learn hunting skills.

There's something itchy in it so they chase and bite their tails...I have long been taking care of dogs and are familiar with their behavior and habits.

to find that answer u have to be a dog
lol
sorry

They're chasing their own tail thinking it belongs to another animal and they want to have some fun but they just don't know the difference.

Dogs are much like republicans only not nearly as stupid. Republicans would chase their tails if they were a little smarter.

Or do the tails chase the dog?....

take a closer look at their tail, its infectiously memorizing who wouldnt want to bite that