A Canine Nonprofit specializing in: Training the Untrainable, Surrender Interventions, and Behaviorist Services; Service, Therapy, and Assistance Dog Certifications; Political and Legislative Advocacy; Rescue Placement, Alerts, and Logistics; an off-shoot MeetUp Group.
I never even have to ask myself this question. Being the owner of a very high energy mixed breed there is no way I could ever tire her out completely. Even after a full day at daycare- She is still ready to take a quick (15 minutes while I get settled after work) nap then go out on our 3 mile walk and continue to have a pretty intense game of tug and/or training!
Is there such thing as too much exercise? Think of a child. What happens when they get overtired? Cranky, irritable, not listening? Well its similar for a dog. Its important for you to do some research on your dogs breed and even their age to see what their typical exercise need is. Then just observe your dog. Different activities and trainings exert different states- mind and body. It is best to work both the mind and the body everyday.
Also with the weather getting nicer, and the days getting longer (We can all shout, YES! here) there will be more time in the day to get your dog out and about. Make sure you bring some water or make sure that there is some accessible for your dog. They can overheat too!
Remember a tired dog is a fulfilled, Happy dog!