I didn't know what a Wizdog was, I had to look it up. I'm thinking that since he is used to pee pads, you could start by putting the wizdog in the place of the pee pad, and place a pee pad on top of it until he gets used to it.
It's really hard to say if it would confuse him. some dogs seem to catch on to things rather quickly and others seem to be very resistant to change.
I am also using the pee pads and outdoors. I'm planning to put in a new storm door with a doggie door in it, hoping it will cut down on the pee pad use.
Also, I don't know where you are getting your pee pads, but you can get hospital pads at Sams club for a fraction of the cost. I got a box of 120 for $25 |