Water, so sam will never dehydrated or overheated. He is a big beast, a mutant of Brittany, with a weight of only about 70 pounds now (he was 75) in the previous year, and I think the combination of organic food we buy for him, his lifestyle and his Sports Daily run at the Fair Hill Park is, becoming such a large dog size. I wish the great management of the Fair Hill Park and all the good people who have to go almost every day and make it a pleasant experience for us ...