I have 2 yorkies, a 14-year-old and a 1-year-old, both are excellent in going on the pee pads. Now, I must confess that sometimes my 14 yo, will make a poop present on the carpet at the front door.
He has always used the pee pads, so we *wife* and I just figure it's part of his old age and he is probably 90% blind. We ask him if he just forgot where he was at and he says yeah... so we just let it slide