It is amazing that after all these years Monk was still able to come up with quirky things to test the cleanliness of the character, such as the dog here tonight. The scenes did not exactly move the storyline forward but they were funny and provided a nice breath of fresh air from the usual things Adrian goes through.
It was also nice to see the first suspect actually be the killer. Usually many shows throw a bunch of curveballs at us, but that is one of the reasons why Monk was so great. It wasn't always about solving the whodunnit, it was also sometimes about Monk trying to beat the evil killer.