I had Trooper and Rosie out to walk on our local wooded trail, and as usual, Trooper ran endlessly through the woods like a madman. While wiping his muddy paws afterward, I noticed a slice on his hind leg. It's nearly an inch long. I thought at first that it may have been just a scrape, but it is definitely a cut (not deep though, there's no blood). He doesn't seem to notice it and didn't mind me washing it.
Should I do anything else with it, or leave it to heal?