Sorry, we don't have this issue, probably because when Tuffy was little he was on the semi truck with dh & I so there were times we had limited amounts of dawdle time. We'd tell him Pee Tuffy & when he did we'd praise like crazy just like they tell you to do when potty training. Well, to this day, I can take him outside, put him down & say Pee & he will.
Good luck with finicky Tessa!