How do I fix my hoover windtunnel mich 6.1?

My vacuum seems to get clogged where the hose goes into the mail part. I have taken apart the main part and cleaned it out - dog hair. When I vacuum again I have to clean out the main part of hair. When I take the vacuum out there is usually something on the floor that did not completely go into the bag. What should I do to fix?

M. Reed, July 2010