Vegetables can be consumed in many forms and still count toward the daily serving requirement. This includes 100 percent vegetable juice and raw, cooked, fresh, frozen or canned vegetables. One-half cup of vegetable juice or most raw vegetables equals one serving.
Pet mice will eat most kinds of vegetables, but they tend to enjoy crunchy ones more. Vegetables such as broccoli, carrots and celery contain a balance of vitamins, minerals and carbohydrates that are essential to keeping your pet mouse healthy. A piece of apple also serves as a healthy treat.
As omnivores, rats eat anything from meat to mushrooms to melons. Store-bought rat pellets should make up 90 percent of your pet rat's diet, but fruits and vegetables can make up to 10 percent of their calories, according to the Veterinary Teaching Hospital at Michigan State University.