[ScizzMoney]

If anything, the other ones will probably learn from the older shepherd (at least from my experience).

I have had to deal with an older dog and trained it to pee on pee pads too. I was working 10 hour days at the time and the dog couldn't hold it. How I trained it to use the pads was I'd place pads outside as well when I went to take it to pee. (I would make a big square of 4 of them). Each day I moved the big cluster of them 4-6 feet closer to the door of the house, I would keep his leash so he could only be on the pads and he'd piss on them and I'd give him a treat after. When the pads got to be touching the house, I moved the pads to where I wanted him to pee and did the same thing. From then on he only pissed on the pads and outside on the grass / snow.

Hope this helps at least a bit.

Good luck