He is best remembered for his animated series Choko the Stork and Boko the Frog,[2] which he also adapted into a comic strip.
[3] His influence spawned a new generation of young Bulgarian comics artists, such as Vladimir Nedialkov, Koko Sarkisian, Ivan Kirjakov, Sten Damyanov,[4] and others.
His series The Adventures of Choko the Stork and Boko the Frog was popular in Bulgaria, during the 1970s and 1980s.
[2] Other famous animated films he directed are Friends of Gosho the Elephant,[2] Treasure Planet,[2] etc.
[2][3] In the 1990s, Petkov worked as a writer, storyboard artist, animation director and director on some episodes of Johnny Bravo, Dexter's Laboratory, Cow and Chicken, I Am Weasel, The New Woody Woodpecker Show and other series.