Shadowhound’s Muzzle

Wondrous item, rare (requires attunement)

If a dog (such as a hound or a mastiff) is muzzled with this item, it undergoes a horrific transformation into a shadow mastiff over the course of 1d4 rounds. It only obeys orders given by you, and only while you remain attuned to this item. No one but you can remove the muzzle.

If the mastiff is reduced to 0 hit points, the dog reverts to its original form and the muzzle is permanently destroyed. If you remove the muzzle (by stroking the mastiff ’s snout), the dog reverts to its original form and the muzzle is undamaged. If you become unattuned to this item while the muzzle is on a dog, its transformation becomes permanent and it acts with a will of its own.