I've been toying with biological mechanisms for species in my current work in progress by combining or enhancing features in unusual ways. This question is about a canine design.
However, Earth's canines have fur, which traps heat. This particular species of extraterrestrial canine has decimated the native shark population and stolen their dermal denticles for themselves. (I jest; the shark population is doing just fine.)
Since sharks are aquatic animals, they're more concerned with trapping heat than dispelling it. As such, I've found it hard to identify research indicating the thermoregulation properties of shark skin.
This canine species, it should be noted, is an apex endurance predator. It combines the pronghorn antelope's light build and long legs with the tendon-style legs of an ostrich, allowing it to outpace prey in the sprint. It's large lungs are attached to its muscles, so the faster it runs the better it breathes; this allows it to top the charts in the marathon hunt.
But all this activity will surely cause a buildup of unwanted heat that must be expelled.
So my question to the community is this:
What's the best thermoregulation system this creature can utilize to avoid overheating, whether actively hunting or hanging out with friends on a sunny day?