Well, theirs can come in a flat bone shape.
Chewing dry hatd thing can clean the teeth somehow.  Dog biscuit usually are sold in a flat bone shape.
How did the idea of dog biscuit come about? 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. Wow so it has been around for hundreds of years! Yeah, but did you hear how manufacturers of it claim it cleans a dog's teeth and promotes oral health? No but I suppose anything to make a buck and I don't know but maybe it's true! Are dog biscuits shaped like the biscuits people eat?
Dog biscuits may be sold in a flat bone-shape.