http://www.palmbeachpost.com/news/co...s/qa/1011.html
Ihrke says the animals most at risk for sun-caused skin disease and cancer are those with short, white coats, light-colored skin and sparse tummy fur. Breeds that fit these characteristic include Dalmatians, bull terriers, Staffordshire bull terriers, whippets, Italian greyhounds and greyhounds. The more sun, the greater the risk, he says, noting that dogs who like to sunbathe and are permitted to do so are at the greatest risk.
Skin cancer can hit dogs as young as 4 years old, he says, which is why prevention extremely important. Decreasing exposure is the only way to protect an animal from sun-related problems.
"Preventing sunbathing, roofs over outdoor runs, and solar protective T-shirts or dog shirts can be very helpful," says Ihrke. "We also recommend waterproof pediatric or children's sunscreens. Sunscreens designed for children are less likely to be irritating and commonly do not have scents added."
Brand names mentioned by Ihrke as being safe for use on pets include Johnson & Johnson's Waterbabies, Bullfrog waterproof and EltaBlock waterproof. The benefit of waterproof products, says Ihrke, is that they're also dog-saliva-proof.
Here is a web page for doggy sunscreen but it seems childrens is okay too
http://www.furlongspetsupply.com/dog_sunscreen.htm