response: Do you mean "dog's bread"? If so, then I'm not sure of how they came to be but know they've been around since the Romans.
original_response: ''Dog bread'' as it was called was already mentioned since the Roman, so they have been around forever
history: How did the idea of dog biscuit come about?
knowledge: ''Dog's bread'', made from bran, has been mentioned since at least Roman times.