Plenty of exposure, they need to see the ferrets all the time and you handling them. I had a nightmare with my Bedlington dog when I first had the ferrets, he kept on trying to nail them! What I did in the end was hold his jaw and let the ferrets around, I even put one of the ferrets to his nose when holding his jaw and the ferret bit his nose!! Not intended mind. Ever since then he has had respect for them but would never ever take my eyes off him around the ferrets, he just has that look about him from time to time.