Most chinchillas, especially young animals or mothers with kits, occasionally have fits caused by low calcium levels in the blood. This may be caused by the diet being too low in calcium or the chinchilla being unable to take up and use the calcium in the diet. In these cases, or if the chinchilla has developed tooth problems, your vet may suggest that you give a vitamin/mineral supplement. However, over-supplementation, or wrong supplementation can cause problems; so do check with your vet first.