Don't walk long in the hot summers. There have been several greys lost to heat stroke taking their morning walk. You could do short, let's potty walks and that is it!
I am fortunate in that my guys love the heat, hate the cold. I brought out the sweaters for the last few days, otherwise, they stay in the closet (the sweaters, not the dogs) This is the first year Huston willing stood and let me put a sweater on him--other years I've had to chase him
75-78 in the house with ceiling fans is comfortable for them. A/C is a must, both in the car & house for all concerned.