Sparky is a hyperactive fairy dog that was once Timmy Turner's pet. He was adopted by Timmy, who wanted a dog after realizing everyone in Dimmsdale had a pet but him, but as he was banned from all the pet stores of the town, he had to adopt a dog from Fairy World.
Three weeks before Timmy met Chloe, Sparky trashed Timmy's house and blamed him for the destruction, and then ran away, with Timmy and his fairies disowning him since then.
Sparky has yellow fur, except on his ears and the top of his head, that is orange. He has blue eyes and a star on his tail, which he uses as a wand.
Sparky is a cheerful fairy dog but is saddened, due to most of the people who adopt him being forced to take him back due to his craziness. He claims he is just doing "dog things" by chewing and digging and running around, sometimes causing trouble for both his owner(s) and others, such as their family members and the people that live in the same town. He sometimes leaves a nasty surprise for his owner(s) overnight because apparently fairy dogs do not sleep and he just does those "dog things", as mentioned earlier.