John Wick 3: How Halle Berry became a dog trainer, and how it trained two dogs.

Parabellum means to prepare for war.John Wick: Chapter 3 is one of the most exciting action set-pieces of this year.These dogs know how to fight.

Director Chad Stahelski tells Inverse that it took months of training to get those hounds ready for battle.

Stahelski says there is no such thing as a movie dog or movie horse.They are trained to do things under certain circumstances.They don't know it's a movie.They do what they do.You don't know if they're going to respond when you train them for months.

Stahelski has two cats and two dogs.The inciting incident for the retired hitman in John Wick was caused by the murder of a puppy.The third movie, out in theaters on May 17, has evolved into a saga far bigger than revenge for dead pets, but halfway through John Wick: Chapter 3, the filmmakers deliver some long-awaited canine vengeance.

Halle Berry plays an assassin in the movie who goes to Morocco to meet another assassin.Two snarling shepherd dogs protect their mama at all costs and are guarded by a woman who oversees a community of contract killers.This includes biting attackers in the crotch and taking down snipers on rooftops.

The script was used to plan for the scene.Stahelski did a lot of research to pick the right breed.The same breed of dogs the U.S. Secret Service use to guard the White House was the subject of his homework.The military and police use that.

Stahelski sought the help of Andrew Simpson, who trained the wolves in Game of Throne, to hide the trainers from the camera.

He wanted to include dogs in an action sequence, but they shoot wide.How do we hide the trainers?Andrew looked up and said, "I think we can do it."

The journey began to find the right dogs and train them, as well as the cast and stunt team, to become acquainted.It is necessary to have months of preparation in order to work with animals.