Tie a bell to the door on a string, Everytime you take him out jiggle the bell he’ll put two and two together. My parents did it with their westie and a friend in Hs had a lab trained that way, eventually he’ll ring the bell himself
I remember the first time I saw one in the UP I was on hwy 2 I thought it was fake. I did see it a mile away and I was like
WHAT.....THE........FUCK?!?!