The Chickenpoxer is a dragon that appears in several books of the How to Train Your Dragon Book Series.
Physically, Chickenpoxers are depicted as being rather compact and squat, with small legs relative to their body size. They are covered with mushroom like protuberances, perhaps lending to the "pox" part of their names. Chickenpoxers have extremely hard heads, and can take a good knock on their noggins.
- "Luckily Chickenpoxers have heads built like crash helmets, so that all that happened to the Chickenpoxer was that he saw a few stars."
- ―after running head-first into a tree trunk in Book 8
Chickenpoxers are often compared to the size, appearance, and temperament of a Shetland pony - i.e. small, rotund, and ornery. they are rather short-tempered and are known to frequently buck off or throw their riders, whether on the ground or air.
Chickenpoxers are on the small side for Riding Dragons, and are often used to teach young Vikings how to ride.
Fishleg's first Riding dragon is a chickenpoxer, which first appears in this book.
Fishlegs and his Chickenpoxer appear again in this book. The ornery nature of the Chickenpoxer is demonstrated.