You can try clicker training the dog - every time the dog has a positive
interaction with the ferret(s) - click and treat the dog.  Even if the
dog is just watching them - c/t.  The more POSITIVE enforcement, the
better.
 
I am not in favor of the "alpha roll" - better to remove the dog to
his/her crate.  The dog needs a place to escape from the ferrets.
 
You may also want to c/t the ferrets for positive interaction with the
dog too.
 
Don't get a terrier, even a small one, the in-born prey drive is just too
great.  Maybe a herding breed would work better - imagine a Border Collie
herding ferrets :-)
 
Talk to the breeder.  Explain you expect the dog to co-exist with
ferret(s).  Each puppy is different, the breeder should know which of
her puppies would or would not match your needs.
 
Some dogs will locate lost ferrets . . .
 
merry Christmas to all and happy 2006
 
Nan and Jubal and Early
[Posted in FML issue 5095]