At a castration operated there through so small an entrance hole as possible. When the operation is finished, shut down the small hole with internal stitches. Which means that it is no longer necessary with collar or other annoying bandages.
The only visible sign when the coat has grown back out, is that the scrotum takes up less space.

The operation is supervised by our nurse Michael, who during the whole operation shall ensure that the dog is sedated in the best possible way. After surgery gets wounded lasered in order to speed up the healing process.