Tiddlypom
Carries on creakily
That's not how your post read. I took it that his recall was questionable.I certainly won't. Keeping a dog on a lead for springing a fox once in 12 years does not strike me as sensible!
If he has good recall, and you don't let him out of sight in an area with known wildlife such as foxes and deer, then off lead is fine.
My own dog will chase small furries, so she is kept on a lead.