My friend Ed worked diligently in getting this installed for me. It’s the smallest doggie door they have available on the market (it’s more for cats, but there was a picture of a Yorkie on it, so we knew it would be appropriate for him). He’s already gotten used to going in and out by jumping up several inches. Ed had the brilliant idea to call it the “Montague Expressway” after a highway that connects both sides of the Bay Area near San Jose, so you can see the sign that we posted for Monte’s benefit.