This is so funny in a way. I hardly ever do dogmeat, I hate that whole area and usually do the pangos out in Redhill just because of stuff like the OP was describing.
That said, I have my own personal code that I adhere to, and I ask my guildies to adhere to it also, although they don't always.
If someone is farming a spot, change channels until you find an empty one. They were there first, so they get "custody" per se.
When I do farm dogmeats I usually do it on my little r/s alt, cause she gets a much better drop rate and it just feels less silly than doing a level 50 daily on a level 70 toon. If someone comes and ganks my spot I usually just sigh and change channels til I find an empty one.
My husband, who has a little d/m, farms dogs daily, and he has come up with some interesting strategies to combat the spot "gankers." He dances at them until they go away. It's so funny to watch too, because when he first agreed to play (to spend time with me lol) I rolled him a big burly manly toon. He played it for about 10 minutes, and as soon as I had my back turned he rolled a super sexy elf with big ol' torpedo tits... men

.
So here's this teeny lowbee druid wearing next to nothing, and he's minding his own business, and some big mean endgamer comes along and steals his dogs right? He waltzes up to them and starts dancing and dancing.... It must be the bouncing pixel boobies, cause they almost always change the channel and let him alone lol lol lol.
My advice? If your toon has boobies, shake em