Still trying to get my head round this...

Back in the 70s - must have been as we lived in Speldhurst nr Tunbridge Wells at the time... A kid walked in UNIVITED into our our house and Portia, our by then about 16 yr old lab/retreiver cross managed to get up and nip only enough to bruise the kid's bum.

My parents got cautioned over this and warned about keeping a dangerous dog and the rest of the riot act... a dog so old and unwell would be put down if ever she tried to defend our house from what was effectively an intruder.