Spitfire Dragons resemble miniature dragons and can be as big as a two-year old Muddlet calf. Loose flaps of skin on the sides of their bodies resemble small wings which puff up when Spitfire Dragons attack, causing their scales to change from a dull, grey-blue to shining silver.
Spitfire Dragons spit their peculiar venom at their prey or at attackers. They also puff themselves up when trying to attack or defend themselves. Spitfire Dragon venom, despite its fiery appearance, does not burn or blister; instead, it numbs and paralyses the affected area, spreading very quickly if the venom is not washed away.