My dc14 animal works fine in Vaccuum mode but when I switch to the extendable tool the sound of the vaccuum changes to a higher pitch noise and I get very little suction through the hose. Any suggestion

Your hose has a restriction. To fix this, use a broom handle and insert it into the hose as far as it will go. If the hose can be removed, take it off completely and do this, if not be careful so as to not damage the sweeper with the handle. another way to fix this is to blow compressed air through it (this is good to do to all vacs to keep them working good) You can get the compressed air from an air compresser or a shop vac or even a leaf blower, but that will take two people. Once you clear the blockage the sweeper will work fine again. best wishes!