GunDogsOnline.com has a large selection of dog bells.
http://www.gundogsonline.com/dog-bells/
You might be able to find a bell maker in Munich and use it for your dog since dog bells can come in all shapes and sizes. You can even train your dog to ring a wall mounted bell to go out or come in!
So it really depends on what you're going to use it for.

If you are doing research on the Pavlov's Dog theory, you can use any kind of bell since the dog won't be wearing it!
http://nobelprize.org/educational_games/medicine/pavlov/readmore.html

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