Gibson's Dog
Interesting reference to Guy Gibson and his dog Ni44er in the period when Gibson was Boss of 106Sqn at RAF Syerston in March 1943, shortly before he left to set up 617Sqn.
" I also met for the first time the overgrown menace that was Gibson's dog. He was a black mutt with a white chest and appeared to be mostly Labrador retriever; he was reputed to deflate bicycle tyres with one bite and I was warned by one of the gunners to treat him with respect."
From "Lancaster to Berlin" by Walter Thompson DFC*, RCAF.
(ISBN 0 907579 04 3)
So, it seems that the friendly, all-black and pedigree Lab in the film may have been slightly mis-cast.