Super exciting plan... A dog is already happy with 2 walks/day. If you take him out more than twice now he'll get use to it quickly. And when you can't do the usual, he won't stop asking you for it (walk). Also, dogs are very good in keeping it in (you know). So they're ok overnight until their next walk in the morning. Well, at least that's what I remember with the dogsitting that I did for years... it will be fun.