Personally I would just baby gate off an area & put a nice bed in one corner & a vinyl with a folded towel on it for wees in the other. wash it when you get home & then your dog is not having sit in wet urine when sleeping in bed. Thats IF you think the penning in is necessary. My dog at 12 weeks had free reign & would go to the bathroom to wee on her wee mat. Once I had the section fenced & catflap in- she would go outside when she needed to go. No dramas. Also wash the bedding well or buy new, cos if it even faintly smells of wees- then your dog will usually keep going there. If its cold, some people supply a heating pad, or warm up a weati bag or hottie & put it under the bed blankets. But make sure not too hot, put double fitted covers on & make sure your dogs not likely to chew them. I leave my dog a warm, not hot hotty, with a padded cover + a fake fur cover on & she's never chewed it. It releives her sep angst alot. Also make sure the vol is on low on the t.v & the programmes arent likely to be causing angst like gun shots, barking dogs or babies crying etc. They have sensitive hearing- so dont need it even at our normal vol. Keep the pen open when your awake & home so your dog doesnt get sick of being in there.