sorry to hear that Ian.
had a custies jack Russell nip my fingers through letterbox.
text custie as p`d me off she apologized and luckily dog let go when I sqealed

had a postie on my round and his workmate lost two fingers dog wouldn`t let go through letter box.
He showed me a gadget postie`s have like a big plastic hair slide, just puts distance between your fingers and letterbox.
I`m sure as the law goes dog takes no blame.
should be a case of dog owner has to put cage over back of letterbox, then again dog owners should pick up dog`s sh!t but a lot don`t.
Speed recover Ian.