Chinchillas require a lot of plant fiber in their diet. They should have a supply of fresh dried hay or timothy grass to eat throughout the day. The hay should be supplemented with a measured amount of chinchilla pellets, given in the morning and evening. Chinchilla pellets can be hard to find, and they may have to be specially ordered in some areas, but rabbit and guinea pig pellets are too short for chinchillas to hold and eat. The extra effort is worth it for a happy chinchilla.
Rabbits also require special attention to the fiber in their diet.
If less then 15 percent of their diet consists of fiber, they can develop diarrhea and anorexia. The best diet for rabbits is measured amounts of high quality rabbit pellets supplemented with a constant supply of grass hay and some fresh greens. About 20 percent of their diet should come from fiber. All pocket pets should have fresh, clean water available to them 24 hours a day. With the exception of rabbits, all pocket pets do best with a sipper bottle hung from the side of the cage, as bowls of water left on the floor of the cage can quickly get contaminated with bedding and feces.