like Dr Doug the DVM said that if a muzzle is needed, to use the basket type and make sure the fit was proper...but she also stressed that common sense should dictate when a dog should be walked, and in the heat of the day is not the time to do it ....and to carry water with you and if the dog is showing stress, put them in a shady area, pour some of the cool water on the head and the pads of their feet and if the dog is alert, allow them to drink on their own...it really is such a sad situation and totally preventable...I would never be able to forgive myself if it was me....