On some motorcycles, the rear fender struts attaching bolts can break allowing the rear fender to unbolt from the bikes concerned. This could occur without prior warning and could result in an injury or a crash. More than 8000 motorcycles have this security issue. The models affected by this recall are: some 2005-2007 Bulldog and Chopper models, 2006-2008 K-9 models, 2005-2008 Mastiff models and 2008 Mutt models. Big Dog Motorcycles.