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This is the one we used.
http://www.workingdogs.com/testing_volhard.htm
They all work the same way. But for them to work you have to remove the puppy from it's comfortable surroundings and have an unknown person do it.
http://www.workingdogs.com/testing_volhard.htm
They all work the same way. But for them to work you have to remove the puppy from it's comfortable surroundings and have an unknown person do it.