I go to great lengths to keep our doggy family members as cool as possible between May and August. They all have 24/7 access to large buckets of cold, fresh water in each of their kennels or at their dog houses, and we have a kiddie pool that the dogs like to play in on hot days.
Because we live only two miles away from a large state park and lake, I often take a pack of dogs to the beach! Here is a video from our sled dog swimming session this evening. It was 10 month old, Tosh's (all white dog) first adventure in the lake!