A teen who felt cheated after fundraising to help his brother starts a charity. By Felisa Cardona The Denver Post Image via Wikipedia Mark Rinkel, 13, of Aurora started Red Alert Dogs for Diabetics to train canines such as Lucy, the puppy he is holding, to be service dogs. (Karl Gehring, The Denver Post ) By selling his secret recipe of regular and sugar-free lemonade, 13-year-old Mark Rinkel raised enough money to get a service dog to help his little brother Jason cope with Type 1 diabetes. But Mark says the dog he worked so hard to get did not detect serious changes in his brother's blood sugar, as was promised, and the dog also bit Jason's hand when he tried to pet him. "It turned out to be a scam," said the boys' mother, Marisa Rinkel. "After he bit my son, we gave him back." The story of Mark's lemonade stand was featured in summer 2007 on ABC's "Good Morning America" and CNN, helping him raise $17,000, more than the $6,000 needed ...