It could just be a quirk of his personality coming out. I've got two dogs, each of whom has shown various stages of weirdness as they've aged.
I would suggest, though, not swatting/spanking him as discipline. It might make him skittish everytime you raise your hand, which you don't want. A shock collar is very effective on big dogs when used as negative reinforcement. (Test it on your arm or hand first, so you know what it feels like and know to use it sparingly.) Use it in conjunction with a stern "no" and you'll only have to use it for a few weeks, most likely.
Dogs do remember if you hit too hard, though. I've only hit my dog once - more than nine years ago when he literally dug up a linoleum floor in an apartment I was renting (boy, was I pissed!). He's never forgotten it - and I've regretted it every day since.
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"If you're walking on thin ice, you may as well go ahead and dance."
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