I was just about to release the shutter with this happy dog in my window. The flattered fella, stopped briefly, posed, and then out of the blue came the photobomber. My model was really confused but nevertheless got an even better pose: "Who the heck are you man? We have a session here."
Following a good laugh for me, the photobomber, and the owner - hopefully also for the model - we continued our stroll, happily ever after.