^^ I agree with LJ. Take them out on a leash, use keywords and phrases to indicate "go potty," and then praise like crazy. Never stop giving praise for a good job.
Find a way to secure the gates to limit freedom, even when you are home. Until their habits improve, limit their freedom to where you can supervise.
It is interesting that they don't have a problem when they are alone and don't have a break for 8 hours.
__________________ Kristin, Max and Teddy  |