If you really want to scare those geese you could get a geese herding dog. One thing you need to make sure is that the dog isn’t killing the geese but just scaring them away. The point of this e-book is to get rid of messes not make them.
The best dog for the job is the Border collie. They have a wolf appearance and scare geese with their stare. These dogs are also very energetic so they love to be working. If you have wanted a dog for a while now, I guess you have an excuse now!