Found

Riley and I retraced our steps and took the exact same walk we took yesterday afternoon and I did find his collar. Apparently the buckle had come all the way open and the collar came right off, which I never noticed. He's taking a small break here - I love the way he crosses his paws.

It is Mr M's birthday today, but unfortunately he has to work. I made him a little cake so he could have a piece before going to work. We'll have a nice meal when he's off on Tuesday.