Excellent work! The Leptocyon was a fox-like mammal and walked on its hind toes unlike its ancestors, which allowed it to sprint more easily and effectively while regulating its stamina. This made the Leptocyon designed for snatching small, fast-moving prey. These smooth assassins were also likely omnivorous, which led to a downfall of not being able to optimise both predatory and herbivorous behavior. The Leptocyon was a jack of all trades but a master none. Your wolf is still too slow to keep up with their prey.