I agree with that, but....there are mad moments, and nasty moments.
When he rushes around at 90 miles an hour, in & out the house & garden, yapping like a lunatic....mad moment.
But when he nips you for ignoring him when thrusting a toy into your legs, and if you dare to rebuke him, he gets worse, growling & snapping, jumping up at you, following me when I walk away...nasty moment. He really is uncontrollable. The more I rebuke him, the worse he gets.
I have been paying more attention to when it happens. It seems to start when he is in a high state of excitement, but doesn't get what he wants. So at playtime, but usually when I want to stop, and at walk times, but only until we are out the door.
Picking his lead up sets it off, I just hadn't realised it was the same behaviour, because it stops as soon as the door opens. If I don't go out the door, he tries to 'kill' his lead & my feet
We have only left him three times, with Benji, and while we were out & when we came home, he was as good as gold