How do you herd the three spotted goats on cryptids island?

On your first trip to Puerto Rico, all you can do is get the bolt cutters (upper left star) and the fur from the fence (right side star). When you return from testing the fur, you find the herder is out to catch the chupacabra. His brother fills you in, so you go to the Snaggletooth Rock (center star) and herd 3 of the spotted goats into the area as bait. Then you get out and wait with the herder for the chupacabra to come.