Whenever we bring our gsd pup to a dog park, he spends half the time chasing cars along the fence. When we walk on a leash, I can usually get him under control by putting him in a sit stay and holding him on a very short leash.
My question is, should I correct him for chasing cars when he's in the dog park? Or will he eventually get bored with it and realize that he'll never get anywhere? I'm just afraid that he might be thinking, oh look, I chased it, and now it's gone, pat on the back for myself.
His usual day at the park: Play with dogs, chase car, play with dogs, "herd" the pom, chase cars....
Any thoughts appreciated.