Hi,
The brush belt is most probably stretched or broken.
Here’s a link to the parts for a [https://www.partswarehouse.com/Hoover-UH70240-T-Series-WindTunnel-PAWS-Pet-Rewind-s/5980.htm|WindTunnel Paws Pet rewind UH70240] if this is your model.
The belt is part #22.
Here’s a link to a [http://vacuum-cleaners.s3.amazonaws.com/kambrook-captivg3-vacuum-cleaner/hoover-vacuum-model-uh70240.html|video] that shows how to replace the belt.
If you search online for 562289001, you will get results for suppliers of the part.