Interesting, though, becasue Colonel (from 101 Dalmations) IS a sheepdog. and that would be an interesting tie in to the story. Particularly since Colonel was living in the house next to the old De Ville manor, and was the dog responsible for sending the message to Pongo and Missus regarding the puppies in "Hell Hall". (As I mentioned in a different thread, Perdita was a wet-nurse in the original book, only in the movie did they change the name of Pongo's "wife" from Missus to Perdita).
I also would not mind seeing the backstory of how Archie ended up with Pongo, if maybe they knew each other in the EF (Pongo must be from the EF as well). But only if there is some sort of relevance in the back story to the current arc.