Slept through first night? That’s a good sign, especially if you shut the door! 😀 we didn’t shut ours in till he was 14 weeks.
Oh you’ve probably guessed right about the cockerdile phase! They are buggers for it, but it passes, round the time they start to loose their baby teeth and go off 3 meals a day. Picking ours up saying no and giving him time out for about 30 seconds in a separate room worked for us. But as I said before that’s not guaranteed to work for you!
We first ran ours just after a year, but have limited to every few months since then to ensure he’s definitely fully grown.
Chocolate cockers are the best! 🙂