Pets and Hot Weather

Hi all pet lovers. My Dog Jake, a Springer Spaniel love to be outside. We are in an Apartment no yard enclosed so I put a leash on so he can be outside in front of the door. This satisfies him but, I find he needs to be encouraged to come in when it gets hot (it is 90 and up here) because he gets to dehydrated. Water gets to hot to leave out. Anyway he loves it when he gets in and is directly in front of the AC now. Water of course is always available.