Free: Contests & Raffles.
I wouldn't let him retrieve anymore cripples for the time being, until he's more comfortable. A goose can scare the crap out of a young dog if they still have enough spunk to hiss, bite, and beat them with their wings. Id only let him retrieve dead birds and get really excited when he picks the bird up. Sounds like you are doing the right thing with a goose wing and larger dummy. He'll come around, he's just having flashbacks of that first killer goose that almost got him! Clint