Hello fellow Arizonian
! I sure know what you mean about our hot summers, ugh. Not looking forward to it right now at all. Freezing some broth is a great idea...just make sure it's low sodium.
Let me ask you, do you worry at all about him being outside alone? I worry about hawks and owls in AZ bc they can pick up dogs up to around 13lbs easily. All mine are under that weight, so I can't let them out unsupervised except in our front courtyard where they're more protected.