Originally Posted by erfunhouse
Do a different class to begin with. I've been in classes with siblings- not fun for the owners, the dogs or other people in class. Have the trainer do some private lessons to make sure you aren't sending signals that are causing the barking. And continue with the training.
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Yes, this is actually what I would do first if you're new to GSDs. Get the trainer to see if it's the handler instead of the dog.