<P> In the season three episode "And They Call It Puppy Love," the Tanner family adopts a dog named Comet, one of the puppies born to Minnie, a golden retriever who wandered from the home of her owners halfway across the country to California and was found by D.J. and Stephanie . Michelle grows a strong bond with Comet over the course of the series . In the season four episode "One Last Kiss," Michelle wanted another dog that was her size because Comet got bigger . In the season six episode "Road to Tokyo," when Jesse is on tour in Tokyo, Michelle decides to dig a hole to Tokyo in order to visit and she asks Comet to dig . In the season eight episode "Comet's Excellent Adventure," Comet runs away when Jesse unknowingly gives her permission to walk Comet by herself (as he was trying to deal with his bandmates in Jesse and the Rippers voting him out of the group due to the intrusion of his commitments to the family and his radio show gig), leading Michelle (and eventually, the rest of the family) to look all around San Francisco to find him (it was the only episode of the series that was filmed on location in San Francisco). Comet comes home at the end of the episode . </P> <P> The production team behind Full House did not want people to know that Michelle was played by a set of twins, so the girls were credited as "Mary - Kate Ashley Olsen" for most of the show's run (making it appear as if a single actress had the first name Mary - Kate and the middle name Ashley). Although the two were credited separately as "Mary - Kate Olsen and Ashley Olsen" during the closing credits in the series' first season (they were not officially added to the opening title sequence until season two but were credited in the syndicated versions of the season one opening titles), it was not until the eighth and final season that the twins were credited as "Mary - Kate and Ashley Olsen" in the opening titles . Despite the fact that the Olsens are fraternal twins, their physical appearances were nonetheless similar enough so that few could tell the difference between the two over the course of the show's run . In season one, Mary - Kate was used more often due to the fact Ashley cried when she was put on set for a scene . </P> <P> In 1989, Mary - Kate and Ashley Olsen won a Young Artist Award for Best Young Actor / Actress Under Five Years of Age for their portrayal of Michelle . In 1990, they were also awarded Young Artist Awards for their work on Full House, in the category of Outstanding Performance by an Actress Under Nine Years of Age . The two also won the Young Artist Awards for Exceptional Performance by a Young Actress Under Ten in 1991 . </P> <P> Shortly after the show ended, two separate book series focusing respectively on Michelle and Stephanie were published . The stories take place mainly during the continuity of the show's later seasons, and include the sisters' friends and many other characters . The plots mainly focus on the characters' struggles and triumphs . Most of the books were not an episode in the series . Michelle is about nine years old and Stephanie is in her teens in the series . The books were mainly published in the 1990s . </P>

Why did they use twins in full house