Knowledge: Pizza has many ingredients and the most common is flour, tomato sauce and cheese. On the other hand, dog's treats are made out of brown rice flour, beef, carrots and more.

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.
What is a dog biscuit usually made up of?
I haven't heard of the usual ingredients but for "dog's bread" has been made from bran.
Oh I see. What other ingredients are there?

Response: Sure, the other ingredients for dog's treats are brown rice flour, beef, carrots and more.