I have to agree with Doc very early in the morning and cut the running time down. I sometimes take them to a field where I can walk around and let them hunt for a little while. And on the real hot days I take them to
some water so they can wade around or swim for a while. I feel sometimes a little exercise is enough to help keep them in shape if the weather is not agreeable. I do not run the dogs to hardfor a very long time in the heat.