When hunting, the wolf must roll a scent dice first, and then once they reach the prey, a hunting dice. This is so what the wolf finds is random, as well as if he makes a successful hunt.
The only exception to the rule with rolling the scent dice is when the area says that there are no prey or only small prey and fish. Only when it says 'roll scent dice' in the prey section of the area description can you roll the dice, but you are still required to use the hunting dice when hunting at any time
Once one wolf has used the scent dice, the other wolves around it do not need to roll again to pick up the same scent, so if the first wolf misses the prey when hunting, the others may still go after it or help it find the prey