Friday we took Zelda to the park for a couple hours, threw the tennis ball hundreds of times, swam in the river, met people and other dogs. When we came home, she napped for a few hours, then was up and ready to play again.
Yesterday, the only 'exercise' she got was a ride in the truck when we went to haul hay with dad. A 30 minute ride, followed by 30 minutes supervising from the cab of the truck, then a 30 minute ride home.
She collapsed as soon as we got home and slept the rest of the evening and all through the night.