My uncle had an Old English Mastiff called George. That was the biggest dog I have ever seen in my life - he insisted he weighed 22 stone and it wouldn't have surprised me, though I was a kid at the time. My uncle was a dog trainer in the army and the dog behaved impeccably, thank goodness.It was obviously very well taken care of. Beautiful dog, just fucking massive like hound of the baskervilles. Was seriously looking at one for a while after but theyre just way too big