We "fostered" Forest when he was 2 years old (with ESRA, I think), about 3 years ago. He flunked out of training for drug/bomb sniffing. It seems he would pee when he found something! Our good fortune. We learned a clue about Forest. Recall in the movie Forest Gump ran across the USA a few times in a row. Hence the saying "Run, Forest, Run!". Well that's Forest's joy. Chasing the ball.
This is a picture of Forest after chasing his ball playing fetch for 30 minutes. I'm certain he could go for hours.
Note the very long drool fangs! Such a guy.