Animals, automobiles, and inanimate objects don't know
that they are being used in a particular profession. But often, especially in cartoons and kids movies, police cars, race cars, police dogs, racehorses, carrier pigeons, etc., will be portrayed as sentient beings who are (or consider themselves) actual employees/professionals in the line of work in which they are used.
- Who Framed Roger Rabbit. Benny the Cab drives the streets of Los Angeles acting as if he were a cab operated by a human, including picking up fares.
- In Beverly Hills Chihuahua, Delgado takes his job as a police dog very seriously.
- The Cars movies pretty much run on this trope.
- The World War II era carrier pigeons in the 2005 film Valiant act as soldiers complete with 'volunteering' for duty and holding military rank. So do the Nazi falcons who pursue the pigeons. (In real life the British really did use carrier pigeons to deliver messages -- and the Nazis really did train falcons to intercept the pigeons).
- Dinotopia has dinosaurs used as beasts of burden, among other things. Since dinosaurs are sapient in this 'verse, this is entirely voluntary and they're paid through Dinotopia's barter system.
- This is the central joke of the Sam Sheepdog and Ralph Wolf cartoons. Both clock in to assume their adversarial positions as protector and prey, respectively, acting like best friends in their off hours.
- On the Porky Pig cartoon "The Crooner Swooner", the hens on Porky's egg farm show their ID at the entrance and punch in to work.
- The Wartime Cartoon "The Draft Horse" is about a plowhorse enlisting into the army as if he were a human recruit.
- Creature Comforts did this fairly often, dubbing recorded interviews with policemen onto animated police dogs, and putting scientists' voices in the mouths of lab rats.
- "One Cab's Family," a 1952 MGM cartoon by Tex Avery, features a taxicab who wants his son to be a taxicab, but the son wants to be a race car, until after a bad crash the son decides to be a taxicab (but with a racecar engine).
- In Madagascar, a police horse gives Marty directions to Grand Central Station just like a human officer would give directions to a human tourist.