What would happen if animals died?

Answer 1

If you are referring to irrational animals ,including microrganisms, I am sure you are, if you are considering a sudden extinction of all animals, mankind would be extinct in the world in a short period of time as well, for our existence are closely attached to irrational animals' existence. (domestic and wild animals.). Extinction of all irrational animals implies undoubtedly on the mankind extinction, consequently ending up all sort of living organism all over the world.
If you are referring to a gradual extinction of all animals, human life could be maintained by replacing animals' proteins used on our daily nutrition for other source of proteins, and by adaptating work formerly done by them for mechanical work, but this would worse our standard of living on a VERY high degree. (pets, the beauty of wild animals, the beauty of domestic animals.) Fortunately, on both cases, we are not running towards this terrible event.

Answer 2

No more milk or beef would be produced for human consumption. There would be a reason why every cow in the world got sick and died and that reason would probably have severe harm to the human population.

Answer 3

We would be dead. You're aware we're animals, too?