Black Obsidian: This is a strong grounding stone and is known as “the protector.” Absorbs and dissolves anger and fear. It can help to prevent negative energy from affecting your pet and is also a very grounding stone. It will help your pet with ailments like fearfulness, underweight, restlessness, and aggression. Black Obsidian is a very protective stone. It is said to form a shield against negativity and to absorb negative energies from the environment.