I have read alot on this it usually a paraside on the floor you need to use maxima 256 it kills staphylocidal,pseudomonacidal,virucidal,fungicidal really works and you can clean the floor and kennel but most let dry and you need to have good ventilation you mix it with water and use gloves and a cover your feet and you will get rid of the problem gor dog food try back to basics go to www.backtobasics.com it is holistic and one that is rarely mention since it show dogs best secret