Idea's on keeping your dog cool during the summer

My pitbull terrier gets hot pretty quickly during the summer. He hates the heat, and he'll just lounge around and do nothing all day because the heat makes him so lazy. To cool him I'll let him play in the sprinkler or kiddie pool. I also fill his kong with peanut butter and other chewy stuff and freeze it for a couple hours. Frozen dog toys are a huge challenge for him and will keep him busy and cool for a long period of time. If it's particularly hot I'll add some ice cubes to his water.