High tailing it around the yard

OK.  So I think the expression "high tailing it" has its origins with deer, not dogs, and particularly white-tailed deer who lift their tails like flags when they run, especially if startled.  White-tailed deer are also known as "Virginia deer" although they can be found in many places in the US.  You can read about them heer, oops, I mean "here",  if you are so inclined.