You joke but a weasel could cause serious damage if it was determined enough. They're extremely agile and hard to hold onto because they can bite you no matter where you grab them.
Depends a bit on what you want to consider a "weasel"
The weasel family (mustildae) is pretty diverse, we don't necessarily call everything in that family a "weasel" but that distinction is somewhat arbitrary.
It includes all manner of critters from the Least Weasel (yes, that's seriously what someone decided to call the smallest weasel) that can be as small as about 4½" in length and weigh about an ounce or so
Up to Giant Otters that can reach about 5'7" in length or Sea Otters that can weigh about 100lbs
And in between you have some things like badgers and wolverines