Scully said the writers/producers came up with the idea of the new dog (voice of Sopranos Paulie G) and were excited with this new character as the future of the series.
I am not sure if Family Guy has gotten to the point where this is their version of jumping the shark, but this is a huge move for the series.
I've always seen the show as being centered around Brian and Stewie.
Bottom line: I love the show. Hate the change. But I am more likely to watch the next few episodes ... Which is hopefully/maybe their goal (as they bring Brian back).