While actual dogs don’t die. Many Demodogs die (including D’artagnan) died when Eleven closed the gate. A Demodog was also killed when Steve smacked it in the face with a bat and another was killed when Eleven used her telekinetic powers to throw it through the window
Not sure why people said no to this. SPOILERS Eleven is abducted immediately after she is born. This is mentioned throughout the series. You see it happen in season 2 episode 5.
Episode 2 - someone vomits when Jonathan arrives at the party. Skip from when Mike takes Will home until Jonathan talks to someone dressed as Kiss at the party.
Episode 5 - Hopper coughs up slime which is slightly triggering
Episode 6 - Hopper throws up into a sink. Skip after Dustin and Lucas agree to meet at the old junkyard till Hopper and Doctor Owen's go down in the elevator to see the portal