I've not bolted one but last year my old hob kept going to one spot in a burrow my lurcher was marking keenly so after a while I decided to break through and caught a whiff of fox. My missus brought the terrier for me and the rest as they say is history .
I can read the lurcher now when he's marking fox so the ferrets won't be going in with one again.
Bolted a few stoats in the past, shellducks, rats and one cat who decided not to bolt but met its match in stumpy the three legged hob