Since Cora has now had 4 sets of shots I am planning on starting to take her outside to potty. We are now gettng her used to the harness, and she was doing pretty well...until she figured out how to take it off!!! She managed to figure out where to bite to undo the clasp, and then she walks right out of it! Has anyone else had this issue? What else can I try because obviously this isnt going to work!