Shield delicate skin. Skin cancer is the most common form of cancer in dogs and second most common in cats. Even though fur provides some protection from the sun, you should apply a pet sunblock every 3 to 4 hours to the least hair-covered spots: bellies on dogs (especially ones who like to lie on their backs) and ears and around eyes on cats, which are also areas where malignant tumors are likely to show up. (No need to apply sunscreen directly on fur.) Use products made specifically for pets, such as Epi-Pet Sun Protector Sunscreen ($18; epi-pet.com), which is safe for dogs—ingredients such as zinc oxide can be toxic to pets.
