Sam as a puppy

Sam in dog form with Sookie and Bill.

Sam in owl form with imprinted owl.

Sam in bull form.

Sam after being force-ably changed into his 'go-to' dog form.

Sam in pit-bull form, possibly showing that a shifter can copy imprints of another shifter by imprinting on them while they are shifted.

Sam and fellow shapeshifters as horses.