Hi, David.
My Zoey would do that. Since the TV was not solidly perched, I was afraid she'd knock it over. What I did was get between her and the TV and walk towards her, forcing her away from it. Sometimes, I would back her completely out of the room, othertimes just far enough away so she couldn't touch it. Then I'd make her lie down.
It took consistency, but she finally learned to watch it without going into attack mode -- and she was very dog aggressive.
kjd
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