I've been looking for a dog sunscreen for Isis because she has so little hair on her head and won't keep hats on for long. She gets a little sunburned now and then and now has freckles on her head. I want to stop the sunburns but the only dog sunscreen I've found is 15 SPF. Is it safe to use baby sunscreen on her? I've found one that has 50 SPF. I don't want to use it on her without making sure it's safe.