RAW says that animal companions count as travelers, and that every traveler has a job. It also says "Jobs can be performed by PCs, allied NPCs, or NPCs hired for the position." (Jade Regent Players' ...
I am about to be a player in the new Jade Regent adventure path from Paizo. It seems like there's a lot of overland travel in Jade Regent and I was considering playing a cavalier or another character ...