Dogs love tennis balls primarily because of their instinctual and sensory appeal. The bright yellow color is highly visible to dogs since they see well in blue and yellow hues. The fuzzy texture of tennis balls feels good to chew on and provides a massage for their gums. Additionally, the erratic bounce of tennis balls mimics the unpredictable movements of prey animals, triggering dogs' natural hunting and chasing instincts. Playing with tennis balls also engages their minds, provides physical exercise, and helps strengthen the bond between dogs and their humans. The chase and retrieval stimulate dopamine release in their brains, making the experience pleasurable and reinforcing their love of the game. However, while tennis balls are a fun and beneficial toy, moderation is important to prevent obsessive behavior or dental wear.