Ps I own 2 terriers I am well versed in stubborn and defiant dogs. Science has come a long way in 30 years, we have learned a lot about animal behaviour in that time. If you feel like reading up on it, Google Patricia mcconnell, Karen Pryor and Sophia yin, all well respected experts in animal behaviour. You can also search for dominance /pack theory debunked and find lots of good info.
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