Vegas has done this 4-5 times, always when he is extra nervous/excited. What I have found is to distract, treat, toy etc.... ALWAYS scares the crap out of me, he did it twice at the vets because he was nervous and our vet actually seen him do it. Our vet just distracted him and he was fine. I think it is just "another bully thing" but it is scary!!!...........And NO I have not gotten used to it, still scares the crap out of me when he does it, even though I know it will be OK!!