It doesn't matter which difficulty setting you are playing on. The seed that the world is in generates the dungeons in different areas. Some seeds generate dungeons that are surface-level.
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monsters do not spawn from monster spawners in Peaceful mode. Peaceful mode prevents hostile mobs from spawning naturally and also from monster spawners, ensuring the game remains free from any hostile creatures.
Yes, it will appear in the creative mode inventory, along with every other block and item (except fireworks and spawners).
Yes but only if you are on normal easy or hard mode they don't explode without you annoying them
you can be on any mode to have a dog, just have a few bones in your hand and right click on a wolf to tame it. it will follow you around everywhere.
I would recommend you get the SinglePlayer Commands mod for Minecraft. It is very easy to install so don't worry about a difficult setup.