All of it, as Dug repeatedly acts as The Millstone for the rest of the pack. "Alpha, the rock moved!"
Alpha: Now, your mission is to sit on that rock.
Dug: Okay! (jumps to the other rock causing the rock Alpha, Beta, and Gamma are on to tilt. The three dogs begin running around trying to even the balance, but the rock falls and the dogs fall, screaming)
Dug: (jumping from rock to rock) Find the bird, find the bird! (Alpha, Beta, and Gamma follow, screaming as the rocks fall and Alpha goes down with one)
Alpha: Ow! I am hurting!
Dug: (calling down) Are you okay, Alpha?
Alpha: (calling up) We will be getting you, DUUUUUUUUUUUUGGGG!!!!!!