@Loobyloo
As a sitter, I have not been asked about my knowledge of what foods could be toxic and harmful to dogs. As a former dog owner, I am though aware of many food items such as chocolate, grapes, onions, and avocadoes, that are toxic and harmful if eaten by dogs.
For dogs I have sat that were counter surfers, I ensured that food items would be out of their reach. If your dog is a counter surfer, that would be worth mentioning to future sitters.
Something great to teach dogs is to “leave it” to prevent them from putting something harmful in their mouths. This could be great for when food is dropped on the floor or while out dog walking. I remember a sit when I was out walking the dog and he sniffed out a chicken bone and put it in his mouth. I immediately said, “leave it” and he dropped it.
I, like most sitters, take great pride in the safety / care of dogs and are aware of foods that are harmful / toxic to them.
Dogs do not know what foods are harmful to them. It is up to us humans to protect them.
Something you could say to future sitters: “You may know this and are aware, but please keep these foods (list toxic foods) out of (dog’s name) reach.”
As for picking up dog poop, many places are required to pick up dog poop. However, even when dog poop bags are provided, many people are lazy, inconsiderate, or do not care, and do not pick up their dog(s)’ poop.
If picking up dog poop is required where you live, you can state in your listing that dog poop must be picked up and disposed of. I came across a listing the other day that stated for the dog poop to be flushed down the toilet.