
I had a similar problem with my older bitch, Saffi, and my pup, Dill.
They both used to sleep in the kitchen, and previous to Dill arriving, Saffi was 99% clean inside, but, if she did need to go, she wouldnt wait long. (Unlike the other dog, Rocky , who can and will wait 12 hours or more rather than mess the house!)
When Dill arrived, because he would mess inside, so would she!
Too cut a long story short here, I now have Dill sleeping in my room, with Rocky. Now he does not mess inside, or very rarely,which we are getting to grips with. This is taking longer because i have a housemate, and unfortunately, in the year he has lived here, he STILL hasnt got it into his head taht when the dog needs out, it needs it NOW, not five, ten , fifteen minutes later, when he has finished his computer game, or tv program.
If they were my dogs, i would make sure that they spent as much time with me as possible, at first, and any time alone was spent in the crate. Do not give them the opportunity to mess in the house, EVER, for at least two or three weeks, or longer.
Towards the end of that time, watch for them asking to go outside, even if its just a move towards teh door, the quicker they make the link between standing by the door, and being let out to toilet, the better.
Do NOT let them play about outside, it should be straight out, toilet, straight back in for a game, fuss, etc. If they are messing about, take them out one at a time, leaving the other crated. IF they still keep playing, take them back inside, and try again.
Good luck, it is incredibly frustrating having dogs that are not clean in the house!
Em