Leather is used in many crafting recipes.
Killing cows, Lions, Horses, Wild wolves, foxes and goats are the only ways to get leather. The only other way is to trade or find chests with leather in them
Leather can be crafted into leather armor, the weakest type of armor. Leather can be used to make a medallion, which is used to tame cats and rename dogs and cats. Leather can also make horse saddels and balloons. Leather also makes great hats for your head! Ans if you want that little bit of Role Play you could act as if its a collectable for your hunt!