K-9: The Complete Collection (K-9 (1989) / K-911 / K-9: P.I.) (3 Disc Set)

K-9:
The extravagant cop Michael Dooley needs some help to fight a drug dealer who has tried to kill him. A "friend" gives him a dog named Jerry Lee, who has been trained to smell drugs. With his help, Dooley sets out to put his enemy behind the bars, but Jerry Lee has a personality of his own and works only when he wants to. On the other hand, the dog is quite good at destroying Dooley's car, house and sex-life...

K-911:
They may have lost a step or two, but Detective Dooley (James Belushi) and his four-legged partner Jerry Lee are still fighting crime with their band of heroics and hilarity. Now reluctantly partnered with a younger K-9 team: the beautiful, no-nonsense detective named Welles (Christine Tucci) and her highly-disciplined Doberman, Zeus. Dooley figures he needs Welles and Zeus like a hole in the head - and he nearly gets one when a mysterious attacker tries to gun him down. Reluctantly, Dooley and Jerry Lee make a plan with their new partners - to trap the madman and then spring into action as fast as their legs will carry them!

K-9: P.I.:
James Belushi reprises his role as the grizzled cop Dooley who tracks down criminals with the help of his canine partner Jerry Lee. This time, Dooley has left the force to become a private investigator and is hired to track down a gang of criminals who specialize in hi-tech robberies.