Will you help me find a way to reward seven-year-olds?

I teach a class at a local school. The kids are learning how to behave around dogs, how to take care of them, and what signals to look out for.

This specific class is on clickertraining, i.e., the method of using a “click” to tell the dog he is on the right track. The click is followed by a treat of some kind.

I’d like to present this concept by having the kids be dogs and asking them to, for example, describe the safe way to approach an unfamiliar dog. A fellow student would be responsible for listening to the answer and clicking for correct responses.

Trouble is – what do I use as treats? Any ideas? I’ll use sweets if I can’t find any alternatives, but I’m leaning toward something less unhealthy…vouchers for something or other, maybe.