Abdullah bin Mughfal al-Mazni · The Book of Hunting and Slaughtering

'I releaser my dog and I find another dog with my dog, and I do not know which of them caught (the game).' He said: 'Do not eat, for your only said the name of Allah over your dog, and not over any other dog.""

"I heard the Messenger of Allah raise his voice with the command to kill dogs. All dogs were to be killed except dogs used for hunting or herding livestock."