Why is my kitten hissing while playing with its toys?

Kittens may hiss while playing with toys as a form of play aggression, where they are mimicking behaviors they would use in hunting or defending themselves in the wild. It could also be a sign of overstimulation or frustration during play. Observing your kitten's body language and providing appropriate outlets for play and energy, such as interactive toys or play sessions, can help redirect this behavior. If the hissing persists or escalates, it may be beneficial to consult with a veterinarian or animal behaviorist for further guidance.