Depends on the goose, depends on the skunk and it also depends on the environment. A really hungry skunk is going to be more motivated to get food at all costs. Some geese are very brave and aggressive, some are not so much. Either type can be injured by predators and rendered unable to fight any longer. If the geese are penned in they have no where to go to get away from short, slow predators such as raccoons and skunks. If they're not penned in however, they're more susceptible to faster predators such as fox, coyote, etc. The only surefire way to protect any of your stock is to lock them up tight.