Old Yeller.
Where the Red Fern Grows
Mad Max 2: The Road Warrior
All these movies portrayed the death of the dog in very melodramatic terms. The 25th Hour: the dog, left to die is rescued by the protagonist, establishing him as a saintly character. Are there any other films where the protagonist establishes himself as a saint or redeems his moral failings by rescuing a dying dog?
I just remembered the interesting “against” case of the classic British WWII movie The Damm Busters (1954), there is a dog that dies foreshadowing the death of several members of the team.
In America all the scenes mentioning the dog’s name were dubbed into “Trigger” because the black dog was called “Nigger”!
Something else about dogs in movies - they can see into men’s souls. If any character is evil but prentending to be good, even if all the humans are fooled, the dog always “knows” and hates that person. Nothing evil person can do will change the dog’s mind either.
There was exactly one good scene in Jurassic Park II. When the T-rex first starts stomping around a suburb somewhere, a dog chained to his dog house sees it and spazzes out, barking it’s little head off. Cut to the owner of the house, on the second story, going to the window to see what the dog is barking at, only to be met by the T-rex’s enormous head looking back at him, with a dog house dangling from its mouth by a chain.
A dog died… and then didn’t die… and then died… in The Butterfly Effect. Pretty violently, if I remember rightly. But it was so hard to keep track, so who knows.