The most effective way to scare geese away is with trained goose-herding dogs. Herding dogs convince geese they are not safe from predators. Only trained dogs working with a handler should harass geese.
Border Collie Breeders and Trainers
Kuykendall Border Collies – Meet the breeders and trainers of Goose Master’s Border Collies. Gwen and Kent Kuykendall can train dogs for either sheep herding or goose control purposes.