The Scatter symbol in The Dog House Multihold is represented by a paw print. Landing three Scatter symbols on reels 1, 3, and 5 triggers the free spins bonus round. During the free spins, Scatter symbols only appear on the last unlocked grid, and players must collect three of them to unlock the next grid. The Scatter symbol plays a crucial role in progressing through the free spins bonus and potentially unlocking all four grids for maximum win potential.