Adams Spot On products for Dogs contain a coat conditioner called lanolin that causes this greasy spot. The lanolin helps to spread the product over the dog’s skin and acts as a coat conditioner as well. After the product is dry, you may brush through your pet’s fur with a brush or comb for distribution of the treatment and coat enhancing lanolin. In households with cats, do not allow cats to groom a treated dog until after the product is dry.