Well Minge any dog would suffice,its main attributes must be; 1, Your choice of dog must be used to the presence of ferrets (asI do, get them all together when young so they feed from the same bowl, and let them play together during the summer months,when winter comes they should be used to each other)
2, The dog in Question should have a keen sense of smell(most dogs have,but for some stuck in houses they only use thiers when the fridge is open) take your dog to a warren let him smell the latrines or perhaps he will give chase, then he will never forget that smell and the exhitement it cause