I would also start to condition the pads for runing on concrete or other hard surfaces. A good paw wax & conditioner in the morning and at night will start to condition the pads. Then apply a silicone wax before your runs to protect the pads from the hot surface and any oils, or other contaminants on the surfaces. Just like you wouldn't run in your bare feet without conditioning and protecting them first.
And remember, if it's too hot for you to stand on the surface in your bare feet, it's too hot for them to be on it too! Test it and stand on the surface for atleast 1 minute. If your feet are burning, the dog's feet will be on fire during the run. The last thing you want is a dog with burned pads. It's horrible for them and then they blister and peel off, exposing flesh and potential of infections.
There are several websites that sell little tubs of paw conditioners and emolients. I use them daily on my dogs cause I get so tired of being scratched up by their rough pads. Also had to use it for over a year to get Buster's pads recovered and healed from extreme urine burns before I got him.
Musher's wax is a great product to use as a protectant for the pads before going out for any running, biking or even walking. It's silicone based so it really protects from snow, hot surfaces and even keeps mud from sticking!! It also helps to keep them supple and soft. You can find it on ebay, amazon and several dog supply websites.