Also keep in mind that at this time of year the safest times of day for exercising your dog is early morning or late evening. Our temperatures here in NoVa have already reached 100 degrees, and my poor Siberian was convinced he was dying if we went out for just a 10 minute potty walk.
Pay attention to your dog; any signs of distress and the run is over.
Also remember that pavement, especially blacktop can be really hot this time of year. Either keep your pal in the grass or buy him some doggy boots so that he doesn't burn his pads.
My Siberian looooves to run and run and run, however he doesn't seem to have any concept of his body's ability. Although he has the want, he doesn't seem to notice or care that his body has limits at his age (between 11 and 13 years of age). This means I have to watch him closely or I end up with a gimpy dog for a day due to the arthritis in his front legs. Although I'm sure your dogs are much younger than mine, you do need to pay attention to how he's doing. Many dogs will keep going past their own limits just for the sheer joy of being with you.
I'm sure this is all stuff you've already thought of, but I'm putting it out there for others to remind them as well.
