You may have noticed that some animals seem always to be infested with parasites – fleas, ticks and worms while others (even in the same household) have only occasional and relatively minor problems. The reason for this can often be found by comparing the general health of the animals’ skins. Skin is the fastest-growing organ of an animal’s body, with the outer layer of cells being replaced every three weeks. Optimum nutrition is essential for healthy skin; if your pet is not properly nourished, the skin will be the first area of its body to exhibit problems.