When his attempt to save his family inadvertently alters the future, Barry Allen becomes trapped in a reality in which General Zod has returned and there are no Super Heroes to turn to. In order to save the world that he is in and return to the future that he knows, Barry's only hope is to race for his life. But will making the ultimate sacrifice be enough to reset the universe?
No dogs die. In the first 15 minutes of the movie there is a crumbling building that begins to fall and a bunch of babies fly out into the air along with a service dog. Flash zooms around and catches all of them safely.
After going on a frenzy, the flash's clothes burn through and he is naked. As a result from losing all his energy he passes out. In addition, Supergirl is passed out when they find her.
Batman 89 dies twice sacrificing himself to the kryptonian army , sasha also sacrifices herself, and Barry 2 sacrifices himself via suicide when he realizes that it is canon event and cannot be changed
*somewhat of a spoiler* in the Siberia scene when The Flash moves a person out of the line of fire, there's two instances of projectile vomit as they react to being moved so quickly. There's no lingering evidence of it after the fact, but the two instances are separated by a fight scene.