|   humping 
  Dog's hump because they want to dominate.
 My dog threw his back out humping, and I had to take him to the vet.  The vet said to not let him do that.  They can injure themselves.  He used to do it on his big stuffed animals.
 
 I have taken his big stuffed animals away, and he is fine.  He doesn't try to hump anything anymore.
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