Thanks, @CoubousAndTourmaIet (you've caught me in a post dinner haze...so I may speak nonsense)
@spartanrunnergirl so sorry for the loss of your girl - 13 is a great age for a Goldie, but I know that won't make it any easier ❤
Depending on the line (some are bigger than others - Xanthos line Golden's are particularly large, for example), he could definitely be able to break out of a playpen (or at least shift it significantly) by 9 weeks or so. One my latest litter managed to shit the entire play pen across a dining room, a 8 weeks old apparently. They're smart buggers, and they're tenacious - particularly when it comes to being with their humans (as I'm sure you know!)
Personally, I would forgo all pen/crate ideas and use a house-line. All mine are on house-lines and I send them to new homes with their house-line (unless it's a return buyer). Two reasons; it gets them use to having 'something' on them before first walks etc, but also gives you control to stop them getting into mischief. So unless you really need to be able to shut him away at points that could be a viable option. If you will need to shut him away at points then I agree with C&T that closing off the kitchen may be the best bet.
FWIW, by 8 weeks he should be able to hold his bladder very well so you may well find that if you have him in your bedroom (if that's what you want), he can hold from about 10-5 from night one - if that's what you're worried about!
@Struckbylightning - sounds like Merry is coming on leaps and bounds. You must be so pleased. I do agree that as long as she's coming back that's something, particularly given her breeds desire to run and of course no dog likes to know their leash is going on😁
If it helps...I can confirm pre/mid/post menopause, puppies are evil.
I am so glad it's better though (both the menopause and ownership of Merry). It's so hard when they're young and particularly when they're so damn spirited and stubborn! I love how her ears are getting even bigger 😍