Plain, sugar free or darn close, wheat cereal is suggested as a treat. Most people break them in to halves or fourths depending on the size. We feed them most nights between nights/days we feed cheerios (sugar so they don't get them as often) or goji berries. Goji berries are more training treats for when they are out of their cage. Chewing wood and certain dried flowers are not considered part of their daily treat limit because these are safe to give in larger or in the case of twigs unlimited amounts. You have to be very cautious about the amount of treats since chins eat so little. They need to ingest plenty of hay and enough pellets for all their vitamin/mineral requirements so treats should be very small and only one a day or possibly with tiny pieces of oatmeal about 2-3 a day. Wood provides fiber, some nutrients, especially fresh young branches with the green layer, and isn't fattening enough they eat it over more nutritious foods like their pellets so it usually doesn't adversely affect the diet in any amount.