Get a wading pool for the backyard, put some water in and if needed toss some hot dog slices in for him to dig out. Do some trick training in the house instead if it's hot.
I had a scare a few weeks ago, it was hot but figured my one dog would pace herself and not overdo it. Not so much, she started to have some walking issues and we rushed her to a nearby water source and got her cooled off, had to watch for other issues for a few days but she's fine now and we don't go for off leash walks where there's no water if it's hot out.
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