I am thinking about trying to help this goose... I have never chased down a "wild" goose. I have had to catch unsocialized dogs (greyhounds) before.. We used other dogs to lure them in and follow the "pack". Would this work with a goose, or is it better to have it isolated? I have 5 runner ducks that herd beautifully, could they work as "flock mentality" to chase it into a chute cage?
First you have to get it out of the pond.
If your close enough you may be able to make friends by just going and hanging out and bringing feed. Evaluate the area and if possibly you could herd it into a large crate or use fence panels with others to help you herd. Best thing would be to go where it is and check out the area. I sure hope you can help it we all have been concerned about it. Keep us updated please.