Cristian Moreni of Italy had tested positive for elevated levels of testosterone, and the Cofidis team withdrew from the race. Spanish cyclist Iban Mayo tested positive for EPO on the second rest day of the Tour, on 24 July. French prosecutors wanted to start a legal case against Vinokourov, Mayo and Moreni, and requested the UCI to hand over the doping samples. The UCI refused to give them, and in May 2011 the investigation was stopped. Other incidents German cyclist Marcus Burghardt collided with a Labrador Retriever during Stage 9. The bike struck the dog on its backside, which buckled the front wheel and threw Burghardt over the handlebars onto the road. A second incident involving a dog occurred on Stage 18. Sandy Casar and Frederik Willems were in a four-man break when Casar collided with a dog running across the road, causing both him and Willems to fall. Casar was able to rejoin the break with the help of Axel Merckx despite receiving road rash on his right buttock, while Willems returned to the peloton. Casar went on to win the stage. After Stage 16, overall leader Michael Rasmussen was fired by his team, , for violating team rules after he told the team that he was in Mexico with his wife in June, then being sighted training in Italy by Italian journalist Davide Cassani. Rasmussen disputed this claim, maintaining that he was in Mexico. Thus, at the start of stage 17 there was no holder of the yellow jersey. Afterward the lead and the jersey were transferred to 's Alberto Contador. Rasmussen later in 2013 confessed to doping from 1998 to 2010, including at the 2007 Tour de France. Classification leadership and minor prizes There were four main classifications contested in the 2007 Tour de France, with the most important being the general classification. The general classification was calculated by adding each cyclist's finishing times on each stage. The cyclist with the least accumulated time was the race leader, identified by the yellow jersey; the winner of this classification was considered the winner of the Tour. There were no time bonuses given at the end of stages for this edition of the Tour. Additionally, there was a points classification, which awards a green jersey. In the points classification, cyclists get points for finishing among the best in a stage finish, or in intermediate sprints. The cyclist with the