Terrible Terror

The Terrible Terror is among the smallest of the small dragons, but also one of the most feared. They are roughly the size of a small cat, and can crawl into Viking homes, sheds, outhouses, and shacks and attack when their prey is least expecting. The only warning a Terrible Terror gives is the hissing sound they make just before breathing fire. They are capable of such pinpoint accuracy with their flame that they are akin to snipers. The Terrible Terror loosely resembles the Common or Garden Dragon since they are both small and usually green.

Trivia
The growling and other sounds of the Terrible Terror is actually based on a purebred Chihuahua from Cotton Grove. http://cottagegrove.kval.com/content/hit-film-how-train-your-dragon-features-voice-chihuahua-cottage-grove