Pooch was hired to serve as Calvin Candie's personal bodyguard and protector. He is always seen with a scowl on his face and frequently had at least one hand on his pistol. He also separately carried a double barreled sawed off shotgun in the most dangerous of times.
Despite being Calvin Candie's bodyguard, it appears Calvin Candie always seems to somewhat respect him, always referring to him as Mr. Pooch, even in tense situations.
Pooch was known for his lack of house manners, such as wearing his hat inside, or taking great offense when someone speaks to Calvin Candie out of turn, indicating a big level of reverence and loyalty to his boss.
During the ride back to Candyland, Django and Mr. Pooch had a tense moment when Django deliberately pulled Coot off of his horse, in response to a racist comment directed at him, breaking his collarbone. Django quickdraws and already has his revolver pointed at Billy Crash and Mr. Pooch before either could draw. Mr. Candie then instructs them to remove their hands from their holsters, and reminds them that Django is a guest.
He is killed by Django with his own pistol after he shoots Dr. Schultz into the library's shelves, in retaliation for the death of Calvin Candie.