He is soooo cute!
I have been taking Jackson since he was pretty young (I think 6 months). He absolutely looooveddd it for a long time, he would always find a dog to wrestle with, and run with, and he's really fast. By the time he hit about 3 ish, he's very 'meh' about it now. He will be 5 in October. He is still perfectly fine in there, very social, but it's very rare he will run a lot or play or wrestle anymore. He prefers to walk around, smell everything, pee on stuff, he will go say hello to the other dogs, and he sometimes finds one he really likes but usually we go just for the smells nowadays. It kind of makes me sad.
This is how he used to ALWAYS be at the dog park, and he still gets like this every once in a while, but not as much.