Fox when unleaded from a fence post came be leaded again

Okay me and !y friend on our switch are trying to lead our fox Waêfinder to our new building we made and wen we could not get them through our fence gates we had we placed a fence down but it was too far from the entrance and they were stuck so we undone (from the fence) the lead and now we can't get Waêfinder back on the lead

Edit: neither can they get in a boat