Hunter pets inherit 200% of a hunter’s armor, while warlock pets, with the exception of the voidwalker and felguard, inherit 300% of a warlock’s armor. Voidwalker and Felguard each inherit 400% of the warlock’s armor. With the 40% damage reduction passive voidwalker has in combination with it having 400% of the warlock’s armor, it’s pretty durable against physical damage.