My senior GSD goes outside to lie in the sun when it’s well over 100. But she was born and raised in this climate. My Husky was born and raised in northern CA, where A/C didn’t exist in homes because there was no need for them. So when I moved back to the desert, I was worried he would have major issues acclimating, but he goes outside and play fights with another puppy (not mine, a friends that is staying with us), and he just jumps in our pool to cool down. They have an air conditioned dog house as well, and half the time they prefer that over being inside. The pup I recently purchased came from Washington, and she has issues in the afternoon. After a pee and poo break, she is super hot, and can’t pant, so I have to watch her like a hawk. Her brother (the friends pup) doesn’t seem to be as affected as her, likely because he can pant when he gets hot.
A doggie pool is a must if you keep him outside, it’s the quickest way for them to cool themselves down, and make sure to put it in a spot the is shaded so it doesn’t get too hot to use.
We use one of those big rubber 5 gallon tubs for water, and halfway through the day I flush it with cool water because that gets hot as well. If you can’t flush the hot water out, leaving it under a water valve turned on to a steady small flow will do the same thing.
Don’t use anything black, or metal for food or water, they can burn themselves on it in the summer months.