Knowledge: The ingredients that is mostly used to make macaron are powder sugar and almond flour. On the other hand, dog biscuits are mainly made by brown rice flour and peanut butter.

Conversation:
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?
Well, theirs can come in a flat bone shape.
Hmm I see. Wat is the mostly used ingredients to make dog biscuits?

Response: Yep, dog biscuits are mainly made by brown rice flour and peanut butter.