looked on the internet and here's what found...
Feral dog. A dog that is not of any particular breed. Not just a mutt or a mixed breed - beyond that. What you get when pure breed dogs are left in the wild to reproduce - after several generations, all the mixed breed dogs look the same: stocky, tan/brown, stocky curled tail. They're called "nigger dogs" because niggers couldn't afford dogs with papers - they took in stray feral dogs.
Besides that, there was music with the same name.