if you have a dog chained up in your yard

(all day and all night), well #1 i don't know why the hell you HAVE a dog if that's the case and #2 please please please make sure that dog has adequate shelter and water, especially in this intense heat. and of course i don't have to say this but i will NEVER leave your dog in the car in weather like this. YOU wouldn't last long in a hot car (it gets WELL OVER 100 degrees VERY quickly) so they wouldn't either.

Dogs who are left unattended in back yards, even for a few minutes, face
danger every day of the year. They are abducted, poisoned, and beaten, and they
suffer from stress and loneliness. In the winter, they suffer from frostbite,
hypothermia, and dehydration

Heat Wave Spells Death for ‘Backyard’ Dogs

What Climbing Temperatures Mean for Dogs

The “dog days” of summer pose a particularly dangerous threat to “backyard” dogs: heatstroke. Many people know about the danger of leaving dogs inside cars during the warm summer months, when temperatures can climb to well above 100°F in just a matter of minutes. But for backyard dogs chained outside and deprived of water, shade, and ventilation, the threat of death has nothing to do with cars—even though they might be tethered to an old jalopy. Baking in the summer sun in a barren yard—day after day, week after week—takes its toll and kills many of these animals.
Beating the HeatBeating the summer’s oppressive heat is extra tough for dogs, because they can only cool themselves by panting and by sweating through their paw pads. Heatstroke can occur quickly and can result in brain damage or a gruesome death that’s often preceded by panic and seizures.............