Sorry, I know this is tough.
I'm sure others with more experience will chime in but with the wrapper example, that's a great time to use the "trade up" process - offer him something higher in value to him than what he currently has.
I wouldn't have thought the grass would be a problem, either, so I would have made the same mistake but I guess in future use a muzzle.
Keep us posted - I look forward to what others have to say.