It took me a while to introduce my dog to the ferrets as from a really young age he was always eager to chase things regardless (he was never a hunting dog he was a rescue) He would snap at the ferrets at first so a muzzle was introduced which partly helped. But the key turnaround was when he went for my big bino jill and she turned round and gave him a set in the chest/leg, now he respects the furry stinky things and will move out of their way (kits and adults) but thats just him. And I definantly wouldnt trust him alone with them (common sense)
Cheers
Jordan