Sparky is a fairy dog that joined Timmy Turner and his fairy family in Season 9, though initially, he was going to appear in Season 8. . He is voiced by Maddie Taylor. Due to negative reception, he didn't make any appearance in Season 10 episodes.
The All New Fairly OddParents!
Sparky appears in "The All New Fairly OddParents!", but this time as a villain. In the show, it's revealed that he ran away from home after trashing Timmy's house one time, and joined the L.O.S.E.R.S.. Mirroring the complaints amongst the people who watched Season 9 of the original series, the L.O.S.E.R.S. members eventually despised Sparky for his reckless, irresponsible, clueless, selfish, and downright obnoxious behavior. A few dozen episodes later though, Sparky decides to quit the L.O.S.E.R.S. and travel all around the world as a fairy godsidekick for various endangered species.
↑San Diego Comic Con 2012 - Fairly Odd Parents Panel