My German shepherd dog and I are inseparable. Last year, I did not bring my GSD to Bimmerfest East, and it was absolutely the correct decision. Late August means bright sunshine and hot temps. The venue offers little shade and very little grass. Moreover, your dog will spend most of the day on hot asphalt if he tours about with you looking at cars. If temps are anything like last year, I would be afraid that your dog might suffer heat stroke. If I had to bring my dog, I would park in a strategic place where I could set up a beach umbrella or some other protection from the sun, and absolutely bring lots of water and ice - last year there was only one vendor selling water and the line was crazy. BTW even though I wore a hat and sun screen - I got a sun burn last year.