If you have bermuda grass in your lawn that hasn't been treated with chemicals or fertilizers, you can wash it off thoroughly and offer a handful to your chinchilla. It is almost a tonic to chinchillas and helps to clear up any digestive problems. In theory, chinchillas only need their pellets and hay. However, part of the fun of owning a chinchilla is giving it those little special treats from time to time. In fact, there probably isn't a pet chinchilla owner who doesn't give their chins treats.
Treats are fine in moderation, but too many can easily upset a chinchillas delicate system.
A rich diet with too many treats not only results in a fat chinchilla, but also will shorten the chinchilla's lifespan. Just remember that most chinchilla health problems are related to an improper diet which is rich in too many goodies. Chinchillas, like people, are individuals with their own particular favorites when it comes to treats. If there is one treat that nearly all chinchillas love, it is raisins. A half of a raisin can be a great training aid when trying to teach a chinchilla a particular behavior.