Flaaffy is debatable, but it has lost most of its wool coat already and wouldn't be worth the hassle in my opinion.
Wooloo and Dubwool are not in yet, so hard to say what is planned for them. It would make sense with their lore and might look kinda cute (or cursed) - but you could argue that it doesn't work in context of their Fluffy and Bulletproof abilities... Maybe just a trim?