Golden Retriever Pillow Cases

How should a baby pup be left to sleep in new home?
We only got him this morning. He’s a golden retriever, and 7 weeks of age.
We gave him a large pillow to sleep on.. about 3″x3″ and two small blankets.
He’s been sleeping in the family lounge room at the moment on his large pillow. Dad think we should put him in the bath tub in case he needs to potty in the middle of the night. I was wondering if it was okay to just leave him where he is?
he just went to loo before we let him back inside and go to sleep.
All answers are appreciated, thank you !
Oh, i forgot to mention, this is just temporary.
Until we go out tomorrow to buy supplies and all for him.
Thank you to all the people that have answered!
Buy him a crate and let him sleep in there. That will help potty training and keep him out of trouble when yiou cant watch him.
Webkinz Stop Motion Shelby makes her bed