The "Cousin" Dragon is a large, unintelligent species of dragon, and is also Hector's species.
A "Cousin Dragon" appeared in "It's a Dragon's Life" where it seemed to become "friends" with Hector.
The dragon seems to like eating manure and anything it can fit in its mouth. It also was shown to be able to stand on two legs. As shown in Hector, the species seems to have flammable urine.
Both wild and their much smaller domestic cousins like Hector have an odd fear of dogs, and will do whatever it takes to get away from one.
Oddly enough, the species seems to come in not only blue, but orange.