Small Animal Fangs are looted when you kill ... you stock up on plenty before a big excursion. When you have your bow and arrows ready to go, all you have to do to use them is equip your bow ...

To craft a bow in Runescape Dragonwilds ... so you only need to craft three sets to equip yourself with 99 arrows. To gather small animal fangs and feathers, just hunt some of the local wildlife.