Try a frame... Emma does this too...super annoying.
Try getting one of those pad frames from PetSmart-this helped her realize when she's ON the pad because she has to step over it, rather than just onto it. I think they run about $15, but well worth it if it works. Also helps keep her from folding it up, pee leaking underneath, and her tearing up pads.
Still...she does miss sometimes, but I find it's much better with the frame than without. |