Bit of an odd one, I know but I've been asked to make dog friendly pizza. This is specifically for dogs, not intended for Humans to eat 
Wheat is out, so I will use gluten free flour to make the dough. I understand that yeast dough is also bad for dogs, as it rises in their stomachs, but is baked yeast dough ok?
Would a tomato puree type of sauce be suitable for dogs? No onions or garlic, naturally. I might just spread the base with dog food instead as I seem to remember that tomatoes aren't great for dogs.
I'm thinking of topping it with dog biscuits or treats and sprinkling with a small amount of cheese before baking.
What do you think? Obviously this is intended to be a rare treat, so a bit unhealthy isn't the end of the world, but I'd hate to include anything that could actually be harmful.
I'd appreciate your opinions 