Semi new?

Hi im still fairly new here an even though i know where most things are im still a bit lost on how to set wolves for sale. Will i need to unlock it or something after doing a quest or is it just somewhere im not seeing??

You'd first have to make sure the wolf you want to put up for sale isn't on a cooldown, you can check this on their page. If it's a puppy they'll have to be weaned before you can sell them. 

You just go into the trading centre, click on create a trade and if you scroll down there should be a list of wolves that you own that can be put up for sale, it's right above your item list. Just set your buyout price (or leave blank if you're looking for offers) and then create the trade.

Edit: You also need to make sure that they don't have a pack role.