The problem is the heat produced in the shoes. Since they are so warm many people's feet sweat in them making them smell, and the fur makes the smell stay. One suggestions would be to obviously wear socks,
that's what I do with my
uggs. If you would rather not wear socks then you can try washing them, but you can only do it by hand because the washer may ruin them. Be careful tho because they are easily ripped when wet. If that doesn't help enough then get odor eaters for shoes and use them when you aren't wearing them. If possible many people have started to replace the inserts in their
uggs. Click
here to see a website that sells these inserts and click
here for a website that sells odor eaters.