See Spot Run (2001)

A drug sniffing agent canine is a target for an assassin boss so the FBI calls Witness Protection to send him somewhere else Meanwhile a single Mom puts her 6 year old boy James in the care of her irresponsible mailman neighbor Gordon when the babysitter bails on her Meanwhile an assassin mob boss hires 2 goons to kill Agent 11 But when 11 escapes from the van when they tried to kill him he hides in Gordons Mailtruck that James is in too And guess what they name him Spot