A Hound's Tooth is a resource that is obtained by killing Hounds, Red Hounds, and Blue Hounds. Hound Mounds, once destroyed, will also drop three Hounds' Teeth. This item can be used to craft a Dapper Vest, Blow Dart, Sewing Kit, and Tooth Trap.
Aside from waiting for periodic Hound attacks, the only way to acquire Hounds' Teeth is by visiting a Walrus Camp (in Winter) or a Hound Mound and fighting the Hounds and Blue Hounds that spawn. This can be extremely dangerous and should not be attempted unless adequately prepared.
In the Reign of Giants DLC, Hound's Teeth can sometimes also be obtained by destroying Tumbleweed and hammering Bones. Another method to get Hound's Teeth is to track and kill a Varg. The player can find a Varg by tracking down a Koalefant. However, tracking a Varg can be difficult as there is only a 5% chance on day 1, which increases over time to 33% chance on day 100.
In the Shipwrecked DLC, Crocodogs and Sea Hounds also have a chance to drop Hound's Teeth. Crocodogs replace Hounds during periodic attacks, they will follow the player both on land and on the Ocean. Sea Hound attacks can be triggered when meat or fish food items are dropped on the water. They can also spawn after Fishing in a Shoal.
- According to Wickerbottom, Hound's Teeth contain brimstone, also known as sulfur. In folklore, sulfur is often associated with demons, implying that the in-game Hounds are Hellhounds.