Before 1990, in USSR and in many countries of the Eastern Block, it was a part of life to have Russian movies about WWII on TV. There were only 1 or 2 channels to watch and such movies were aired in prime time a couple of times a week. If a family would sit for dinner and have the TV on, chances were that they would see a couple of such movies a week. Such movies aimed to show the horrors of the war, the brutality of the enemy, and the heroism of the Red Army. They were full of screams of agony, death, hunger, and concentration camps.
As for deaths of animals, just a century ago the majority of the population lived on farms, where animals were a resource and animal death was part of daily routine to affect children in any way.