We are importers of the electronic pet feeders used for dogs and cats. This is a large capacity (45 cups) feeder and is suitable for all sizes. It works best with small types of pellets. You do get smaller pellets for big dogs. Nutriphase can be bought at all Pick n Pay stores. Cat food is normally small enough. The unit is fully programmable. You set the portion size from ¼ cup to 2 ¼ cups per serving. You can have from 1 to 4 servings per day. It is equipped with a voice recorder so you can record a personal voice message for your pet and your pet hears your voice at every feeding time. It is battery operated. This unit is perfect for weekends and also for those with irregular working hours. It prevents your animal from overfeeding.