I have a snail with a collapsed mantel. He's still alive, however, I'm afriad it may be kindest to put him down. I've read that you can put them in the fridge or freezer but I've always used clove oil with fish I had to euthanize. Would clove oil work with a snail? Is there a more humane/painless way to do it? No, I can't smash him with a hammer, so that's out...