Spaying or neutering can significantly modify play fighting behaviors in cats by reducing the influence of hormones that drive territoriality and dominance behaviors. These procedures typically lead to a decrease in aggressive tendencies, making interactions more playful and less serious. Neutered males are less likely to display dominance-related aggression, and spayed females experience fewer hormonal fluctuations, which can contribute to irritability. Overall, spaying or neutering tends to promote a calmer demeanor, leading to more harmonious interactions between cats in a household.