Bulldog

A muscular, medium sized dog, bulldogs weigh 1d16+29 pounds. While the current breeds were bred for companionship, bulldogs were original bred for fighting, bull -baiting, and aggression. When a bulldog bites an opponent, it latches on, doing an automatic 1d3 damage per round until it releases its hold through a successful Mighty Deed or an opposed Strength check vs. +4. When a bulldog is removed through an opposed Strength check, the victim takes an additional 1d3 damage. Bulldogs are subject to various infirmities, and age rapidly. Their natural lifespan is 1d3+9 years. They cost 1d10+5 gp, although a prized fighter might have more Hit Dice and be worth considerably more.