I have not been keeping up with this real well, but many of the posts
seem to indicate that the actual ferret is being run into objects.  While
I have not seen the movie, and probably won't, the promos that I've seen
show a stuffed animal prop bumping into objects.  There are laws against
harming in filming.
 
James, Melissa, Kassidy & Jasmine
 
Loving:  Bebe, Riley, Fred & Max
Missing: Wheezer, Pym, Rikki, Jako
[Posted in FML issue 4401]