That's a pretty logical guess, but keep in mind that we're talking about a series where lovers gravitate to the hero who farts the best. Logic isn't really Fable 3's strong suit -- as evidenced by the fact that the game's first premium DLC, the "Dog Outfit," is actually a costume worn by the player.
The getup will run you 160 Microsoft Points ($2), but that price should be justified by the strange looks your pet will give you when he sees you dressed as a giant version of himself. Not to mention the strange looks we will give you, because, hey dude, you just bought a dog costume.
[Thanks David!]
