My canine companion is a fine specimen of her species.  Her sire was a chocolate lab and her dame a rottweiler.  Her appearance is that of a burly black lab.  She is most loyal and sweet tempered, but protective.  Though her bark is indeed worse than her bite, said bark is appropriately intimidating.  Furthermore, she is a skilled hunter.  A bug hunter.  Let not a fly or other buzzing beast enter her domain for she will not rest until it has been slain.  She stalks them most diligently, giving chase heedless of individuals or furnishings that lie in her path.  (Collateral damage is an unfortunate inevitability in this war.)  She is not deterred by such trivialities as doors and windows.  Nay, she will continue the hunt until all wayward insects have been destroyed, their carcasses left as warning to other would-be arthropod interlopers. 

Who needs an exterminator when you have a crazy 80+ lb dog tearing around the house killing bugs?