Keep A/C on and windows down anytime the car is parked. Never set him down on your dashboard or any other part of car, just your lap or a cloth covered seat. No leather. I once had a customer set a baby on the dashboard, with windows down and A/C on, and he almost died. Within two to three minutes of us just standing there and talking, he turned crayon black and gaped for life. He did make full recovery as I noticed it quickly. But I knew to keep eye out as a previous customer left his on the dashboard. Sadly to say, it didn't make it six miles from my house. This was in mild 78-80°f temps. Remember the car can add 20°f. I would open the top every 30 minutes or so to allow fresh air in and cool him off. Keep a small mister with you for frequent drinks to keep him cool. You could get one of those dollar store water spraying fans as emergency prevention. I only say all this, cause NM can be EXTREMELY hot and dry right now. Good luck.