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Oats, dried seeds, and other grains are great to give to a chinchilla that doesn't eat much more than pellets and hay. These types of supplements can be a great source of calcium and other minerals. Once a week to every two weeks seems to be a good frequency for feeding it.
1 Alfalfa hay cubes are high in calcium and they can be offered to healthy chinchillas 2-3 time a week. 2  Dried Rose Hips-It is one of the best treats and can be offered daily 1-2 rose hips. 3  They are high in vitamin C and have plenty of fibre.