Answer:
Many people own a copy of me. Without me the world would fall.
I am like thunder in your cranium
In wealth I abound; in water I stand; as a fencer I'm valued all over the land; at Venice I'm famous; by farmers I'm prized; respected by law yet huntsmen despised; consternation and ruin ensue when I break; And the beasts of the forest advantage won't take.
In spring, I am gay in handsome array. In summer, more clothing I wear. When colder it grows, I fling off my clothes. In winter, quite naked appear. What am I?
I am a mountain at night, meadow at day. What am I?
Runs over fields and woods all day. Under the bed at night sits not alone, With long tongue hanging out, Resting at your feet until we go for a walk