The 17-year-old and her pet border collie Gin wowed judges and viewers alike with their dancing routines on the ITV1 talent series earlier this year. They made it through to the final stage of the competition, which was eventually won by breakdancer George Sampson.
Nicholson has since embarked on a national tour with Gin, while her latest project is a dog training manual. However, Kate has confessed that her success has resulted in a frosty reception from some rival trainers.
"We're not really welcome in the doggy dancing world anymore," Kate told the Daily Mail. "The people who have been doing it for years don't like what has happened to us. I think there is an element of jealousy there. You see, some of them auditioned for Britain's Got Talent, too.
"I think people don't like us because Gin and I have won every competition we've ever entered. Some people have trouble with that. Then we went on television, and that rubbed salt in the wounds. But really, it's about more than just us. They don't want newcomers at all. I'm the opposite. I think that whole world should be opened up, so people can see there is nothing weird about it. It is just really good fun."
Nicholson's book, titled Kate And Gin, is released on October 6.