The fellas vocalize so dramatically while playing on the bed. The Husky/Greyhound (Saluki) mix has the high- pitched voice while the little black dog has the deeper, raspy voice. I think he vocalizes to emulate his Husky pal and I think he's pretending to be part Husky like his best bud. Lol. (The Husky-mix--who had been found in poor health in a cotton field--came to us "sight unseen" through Double Dog Rescue network down in Missippi-Tenessee. They brought us the best dog in the world, in every way, and you couldn't buy a better dog at any cost. If anyone affiliated with Double Dog South sees then, then: Thank you :-)