What are the differences between normal dog play and aggression?

Normal dog play typically involves friendly interactions such as chasing, Wrestling, and play-biting, with loose body language and wagging tails. Aggression, on the other hand, involves intense, purposeful behaviors like growling, snapping, and biting, often accompanied by stiff body posture and raised hackles. It is important to differentiate between the two to ensure the safety and well-being of both dogs and humans.