A big black dog umm I think he is warning you of the hellhounds or what ever they are Called they followed the ones that die soon

I would love to have a black dog following me! But only because my black lab died a dew years ago

Don't judge op. I used to be able to see things but I've learned to ignore it. If he is over obsessed you need to get out,but as long as he's nice and doesn't talk about it constantly,you should give him a chance

Why would Sirius Black be following you around?

that's so cool! I wish I had that ability. It sounds majorly creepy that you are being followed everywhere by a large black dog. I would be concerned. It's like you are targeted in some way.

I think you have the Grim!

Is it his penis?

Well some people have what is seriously called the "sixth sence" i sometimes see the future. Just small snapshots in my head of the late future

spirit dog? black dogs are also referred to as hell found. ya know demons. simo he could either be telling you a load of sh*t or you have a demon following you. good luck with that.

A big black dog in the spirit world is a hell hound... When you see it, you die.