The Idea Conveyed From The King's Man

King's Man, a British spy film, describes how a boy turns himself into a secret agent under the guidance of a experienced agent who witnessed the death of his father.

It's an exciting film, but I find something important conveyed from it!!!

That's the order of shooting the dogs who accompany them the whole training session!!! The main character can't do this and it's the reason why he is disqualified!!!

Definitely, I agree on his action because whether or not to shoot the dog is not about the guts, or the justice for the dog does nothing wrong at all!!! It's about the heart!!! 
I think the writer arranges the old agent to die by being shot as the payback of his shooting towards his dog though it's an empty bullet!!! And the "qualified" female Lancelot is abandoned by the main character who finally gets his princess who is with principles as the same reason!!! I don't trust anyone who can shoot the dog for his or her own promotion or anything else!!! 

I believe the God will bestow me someone who loves me, only me, and my dog with 100% heart!!!
I am not superstitious. I'm just believe in the causes and consequences!!!