my pup chases her tail like its going out of style. she gets so carried away with it, blasting into furniture. she gets going so long and so hard she pants like she ran 100 miles. she whines, and snorts. I guess my question is, is this abnormal? I know that its not uncommon for a dog to chase its tail. but what about hours on end? what about so hard that she whines? she does it everywhere. small spaces, on the bed, in the car. some insight please.