Dog question

Jake will go for about 30 minutes at top speed then when he's tired he stops chasing it, just that simple. After 5 minutes and a couple drinks he's ready to go again. Jakes an addict, he even sleeps with his tennis ball. Last week at the lake he had a great time chasing the hearts out of the park owners 2 labs, he was running circles around them deaking and head and shoulder fakes, it was funnier than hell. The labs finally just laid down and panted their brains out.