Houndoom

 is a Tier 5 Tank that upgrades from Annihilator, MX-Gun, Devastator and Steamroller at level 60.

Design
The appears to be an Annihilator with a slightly thinner barrel in it. However, unlike Annihilator, its big barrel is not the full width of the tank. Its big and small barrels are proportioned similarly to Hunter.

Technical
Being a Destroyer Hunter, both of its bullets are quite powerful. Like other Hunters, the smaller barrel fires first, quickly followed by the larger one.

Trivia

 * This tank is one of a small handful that are named after Pokemon. The others are Omastar and Steelix.
 * The Protector is also described as a Destroyer-Hunter, although does not look much like a Hunter at all.