Crispy would still have barked.Those dogs can hear a pin drop and besides the fact that the dog didn't like him it would have had hold of his foot/ankle if he'd attempted to have got through a window. Either way the household would have been disturbed.
Jeremy spent a lot of time at WHF - you talk as if when he entered the house, he had to fend the dog off. Rubbish! There was a claim that it bit him once, that that it hunted him down at every given moment.
Whe I said he didn't break in, I mean I believe he came back before they were all asleep.