"A fun book that shows the transition from potty to big kid toilet that toddlers and preschoolers will love." - Mom Read It blog Doggy has to go. It's urgent. But Little Sis is sitting on his potty! That's because Mouse is sitting on her potty ... Doggy runs past all the potties in the house, but they are all occupied. And now Doggy has to go very urgently. A funny potty book about a little dog who finds his way to the big toilet by accident. For everyone who has to go very urgently.