Has anyone had their dog become exhausted while hiking? I could see this happening if the dog were old or overweight, but I have a hard time imagining how a healthy dog could get worn out before a person.

My vet told me that it's nearly impossible to get effective weight loss for a dog by walking or running them. They are too efficient with 4 legs and weight must be controlled through diet. This leads me to believe that it would be hard to exhaust a dog through walking.

Just curious if anyone has had this experience and if so, were there circumstances that contributed?

Below is Beanie the Biscuit Tracker and she covers at least double or triple the miles I walk on the same stretch of trial, running back and forth, but she is always ready for another mile.