Later, Jinkins worked in advertising, creating TV commercials and promotions featuring a young boy and a dog, which would become the main characters of his major creation. Jim had developed Doug Funnie through doodles during a time of the early days of his career. Doug and his dog Porkchop would star in a popular children's book, "Doug got a new pair of shoes", which evolved into an animated cartoon series. He sold the Doug pilot to Nickelodeon. The pilot tested higher than any other pilot for the network at the time. Jinkins established Jumbo Pictures in 1990 to produce Doug for Nickelodeon. Doug's success caught the eyes of Disney executives. In 1996 Jim sold Jumbo Pictures to Disney. Disney then developed Disney's Doug (originally Brand Spanking New Doug) as part of their "One Saturday Morning" lineup. Jinkins also created the TV show for Nick Jr, Allegra's Window. The fictional town of Bluffington, Virginia, in which "Doug" is centered on, is based on Richmond, Virginia.
Doug is not a powerful character. He is more where I feel that kids are today. They are softspoken and bewildered. But they often make the right decisions. What we tried to get across was that you should feel good about yourself and not give in to peer pressure. The underlying foundation was that doing the right thing will pay off.