I don't know if Colin from Accounts tailed off by the end.
With Ashley and Gordon breaking up. Ashley contacts the real owner of Colin after noticing the lost poster. He turns out to be a mean jerk. He definitely does not want a dog with wheels for leg.
Both Ashley and Gordon looks for other suitable owners for Colin, they all seem to be not appropriate but both are determined to leave Colin behind with someone.
Meanwhile Brett and Chiara are enchanted by Ashley's friend Megan at the party and they both meet up with her again.
If there was an emotional boost, it was Ashley noticing Gordon crying alone. The downside was Colin getting discarded rather carelessly. Even if that was to pursue a possible plot point for a second series.
Overall this was an enjoyable surprise, more uplifting than funny.