I mentioned this a little while back.
The Lodger and the dog shared territory. Neither had much to do with Seniorboy who even then lived in a rarefied fastness in another part of the house - a bit like Sam Jaffe in the original Lost Horizon if you've ever heard of that movie.
One evening, I had roasted a whole leg of lamb and when it was cool, I stripped off much of the remaining meat and gave the dog the exceptionally generous remaining bone as an unusual treat. The Lodger waltzed over to the bone expecting to exercise his normal seniority but the dog, normally completely cowed by The Lodger and not at all a food guarder, clearly thought that it was so indescribably delicious that for once in his life it was going to be All His - and snarled forcibly at The Lodger. And he meant it.
I was slack-jawed with horror, thinking of headless cats, but The Lodger - a very street wise and equable individual - tossed his head and walked back out of the situation with an 'Oh Well - if he wants it that badly......' look on his face.
But he did walk back and leave it. Only time I'd ever known The Lodger take the dog seriously - he usually treated him somewhere between a rather large joke and something you would scrape off your shoe when you came inside the house.