This mob would be pretty scary, roaming areas of the spooky dimension in packs of 3-4. They would spawn more often around Full Moons, but would always have some chance of spawning at night.
Their main attack is a deadly bite, but staying away may not be an option as they can go on all fours if necessary and quickly get in range. They could drop leather, and could rarely drop the leather chestplates they wear.
They are also strengthened during Full Moons, Lunar Eclipses, and Blood Moons #50.

can't werewolves turn you into one if the saliva gets into your bloodstream though?

Werewolf implies that they can become human. Perhaps Direwolf?

That could work. So during Daylight they transform into regular humans, but at night they become Werewolves.

Unrelated question, but if I wanted to add item textures for someone to use later, would I just drop them in the textures/item folder?

Nice.

Sure!