The Donkey Slug is an animal Slug introduced in Metal Slug 6.
The Donkey Slug is a donkey with Vulcans attached to its sides. It's slow and has a weak jump. Like all animal Slugs, it provides no protection to the rider.
A few distances further on in Mission 2, a strange type of carriage with a cannon mounted on the top can be connected onto the Vulcans' hitch. This cannon has the same function as those of an SV-001. Without this accessory, the player is limited in throwing their grenades.
In Other Games
The Donkey Slug is an extremely reliable unit with good all-around stats. Where it really shines is acting as a shield for the deck's more fragile, shooting ally units, as it has an unusually large hit box for its low cost. The arc of its cannon is able to fire over the enemy's vanguard and strike at their ranged units.
The Donkey Slug returns as a playable unit. It introduces multiple variants with the only visual difference being the soldier riding it. All variants attack by firing their Vulcans and cannons, although Fio's Donkey Slug drops supplies from its carriage when attacked.