08/25/2010 10:32 am ET | Updated May 25, 2011

David Letterman Attacked By His 'Satan' Dog (VIDEO)

Jay Leno isn't David Letterman's only rival.

The "Late Show" host told Drew Barrymore Tuesday night that he is battling a vicious dog in his own home.

After Barrymore spoke about how wonderful her dogs are, Letterman rolled up his sleeve to show off a litany of scars and scabs that he says come courtesy of his dog.

"I don't know what to do," he said, saying he had wanted the dog for his son Harry. "On paper, it's a perfect idea."

Letterman joked that the dog is "half yellow lab, half-Satan" mix.

"It's horrible, it's just horrible," Letterman said of his dog, named Sully.