Holy

Holy (ホーリー) is a large, pale yellow dog that Ohm taught to box and stand on two feet. Ohm often tends to ride him around while traveling and fighting. Holy is very loyal to Ohm, and is a powerful fighter who, oddly enough, knows martial arts.

Personality
Holy isn't particularly smart, and will obey almost anyone: when Holy suddenly attacked Zoro, Zoro instinctively yelled the order "stay", which it did. Realizing it would obey him, he then told Holy to "Knock yourself out", and Holy did just that, thereby defeating himself.

Abilities and Powers
Surprisingly, Holy is able to hold his own in battle with a wide variety of martial arts, being able to keep Zoro and others at bay for a short time. It is possible that Ohm has put Holy through rigorous training, judging by his power. Despite his fighting skills, Holy is not very intelligent, obeying orders from even his enemies.