If you consider the greater evolutionary history, up until very recently humans have been kind of like the monster in It Follows. They’re not very fast runners, but they are relentless. No other animal can run for such a long time. They’ll keep going and going for hours on end, and they will eventually catch up with their victim. For an injured prey with explosive strength but relatively low endurance it must be absolutely terrifying.
Dogs joined the dark side, so they probably feel all cool and mighty next to their running master. In their head they go “yeah bitches you can run, but you can never hide from my human”.