Yeah going that far is pretty rare but I can think of two other instances in doujns. The artists name eludes me at the moment but he did something called pet dog appreciation day. Oh yeah, Horihone Siazo! That should be close anyway. The specific chapter title is secret dog god kokoro-chan. There's another one that was never translated, I have it on my hard drive but have never seen any reference to it anywhere else and the site I grabbed it from (da torrents) died long ago. Extremely poor quality scan but if there's a practical way for me to get it to you I'm inclined to share.
"There is no greater sorrow than to recall happiness in times of misery."