(1):

(n.) One of a mongrel breed of dogs said to have been a cross between the sheep dog, greyhound, and spaniel. It hunts game silently, by scent, and is often used by poachers.

(2):

(n.) One that lurches or lies in wait; one who watches to pilfer, or to betray or entrap; a poacher.

(3):

(n.) A glutton; a gormandizer.