I have read, and tend to believe that humans can outrun most animals at long distances because their ability to cool their body gives them an advantage.

Better watch out when she gets the zoomies!

Dogs are much faster than humans. Usain Bolt set the 100-meter world record with a time of 9.58 seconds and a top speed of 22.9 miles per hour. In contrast, a greyhound can run 100 meters in only 5.33 seconds. A greyhound can outrun a horse in a sprint because it accelerates so quickly.
https://www.thoughtco.com/how-fast-can-greyhounds-run-4589314


Obviously, a Golden won't be quite as fast as a greyhound, but still...

can bite human sprinters in the rear end and then claim victory! I've yet to see any Olympic competitor try that!

So not only could a dog bred and trained for sprint racing beat those Olympian sprinters, any such dog would absolutely smoke them.

For short bursts, cheetahs have been timed at 80 MPH.