You have to remember that while you may be cool, your dog is basically wearing a coat all the time. If they're too warm, they can get heat stroke. Cool them down with this awesome collar that has ice pack inserts, but can also be used with regular ice cubes. The mesh inside allows it to cool your dog down while the water evaporate, acting like a mini air conditioner.
My dog loves her Kool Collar and get excited when she sees me pull it out of the freezer.