Hello, I have a 3 year old cross between Chodský dog and NO at home. I found him tied up in the woods and I can't train at all. He is aggressive about it comes from timidity and starts up on people who go against us .... Does anyone have any ideas on how to motivate him and break down bad behavior? Unfortunately, the trainer is about 60 km from us, so we have to train alone. Thank you very much for the advice