This medication is used for treating psoriasis in humans. It is found in the creams and ointments prescribed for this skin condition. Because of the high levels of vitamin D and calcium contained within these products, it is considered toxic to pets. Even a small dose can have severe consequences, so any skin that has recently been treated with the cream, even if it has dried, should not be licked. The high levels of Vitamin D and Calcium can lead to high calcium levels in pets, even in very small amounts, which can lead to life-threatening acute kidney failure. In fact, kidney failure caused by this medication, even if treated quickly, can still become a chronic problem.