A good average sized Jill or 2 will tackle a single rat .again its a an experienced Jill I'd use,.if I had a smallish hob I'd use him too,but I don't have a smallish hob.ratty won't stick around for a fight unless absolutely cornered or is protecting a nest,the experienced ferret will win the fight,however check for any bite marks on the ferret and if so ,best get it seen to.also never use an in season Jill as she's more susceptible to pick up an infection from rats urine.hope this helps