The dog who plays Agent 11 in the 2001 movie "See Spot Run" is a bullmastiff. The breed originated in England as a gamekeeper's dog and is a cross between an English mastiff and an Old English bulldog.
Agent 11 in the movie "See Spot Run" exhibited many of the typical characteristics of the bullmastiff breed of dog. Bullmastiffs are smart, loyal, fearless and good-tempered but prone to roaming as a result of ingrained migration instincts. In the movie, Agent 11 is a drug-sniffing FBI superdog who is retired into the witness protection program after becoming the target of an assassination plot. The dog uses his intelligence and lovable nature to find a safe haven and ultimately elude the bad guys. Bullmastiffs were recognized as pure-bred dogs by the English Kennel Club in 1924 and by the American Kennel Club in 1934.