While searching for treats for small pets, I came across an absolutely ingenious idea that is not only a food reward for your small rodent (rat, mouse, guinea pig) but also a great foraging activity as well.
Start with a bell pepper. Cut a small hole in the side, leaving the top intact. Remove seeds and pith through the hole. Stuff the bell pepper with a few baby carrots, some 2-inch sections of celery, some sugar snap peas and chunks of the removed piece of bell pepper. Hang the stuffed pepper from a string in your rodent’s habitat, and let him forage in it to get his treats. Remove when vegetables begin to get limp, before they spoil.
TIP: Only offer this treat on an occasional basis, as too many fruits and vegetables can cause intestinal distress in rodents.