This is Bhairava, an Ugra form of Shiva. The identification is by the Trishul (uppermost right-hand), Kapala (lowermost left-hand) and the dog on his left side.

The distinctive feature of this Bhairav is his eight arms. It is rare. He is holding a sword, a staff, a sickle, an ankush, a trishul, ?, a bell and a Kapala in his hands, clockwise starting from his lowermost right-hand.

Normally, Bhairava is shown naked, but not in this case. He is wearing a knee-length lower garment. He is wearing a Mundamala, a garland of skulls. An inverted lotus serves as his platform.

The ornaments, including the crown, the sacred thread and barefoot, are other unusual features.

The dog is cast separately and attached to the pedestal. That probably explains the difference in the colour/alloy.

This Bhairava is from Karnataka, and he is about 8.5 cm tall. The wear is extensive, and shows a prolonged period of veneration. This may be dated to the eighteenth century.