Is he fixed? Being from a rescue, I assume he is, but if not that may be an easy way out - it stopped my chocolate lab from marking.
Is he crate trained? That may be a worthwhile start as well.
Finally, exercise is pretty critical. A tired dog is always a good dog.
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"If there's a god, he's laughing at us.....and our football team..."
"When you look at something through rose colored glasses, all the red flags just look like flags."
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