I have noticed this for a while now but for some reason when Clue is really active, like when he goes to the dog park, he gets super hyper and runs around but then he stops and poops. His first poop us usually solid but soft. Then after that it is really runny diarrhea several times. Eventually it's just a gross liquid.

After we are done we go home and his next poop is back to normal.

It happens every time without fail when we go to the dog park, and even sometimes when we go on a walk. 

He has had all his shots and dewormed so I don't know what it is or how I can stop it.

:C