I need an opinion on something.

The person I live with has a dog that he keeps tied up on a chain (bad,
I know) in a pen with a doghouse. Recently, the guy keeps tying his dog
up in the yard rather than in the pen. Even though that annoys me (I'd
rather not see or hear the dog) I understand the dog needs to get out
of the pen occasionally.

The problem is that the guy will now often leave the dog out there all
day and all night. I would like the dog put away by 8pm at the latest.
Part of the reason is because of my cats. When they come to eat the dog
will bark at them and scare them. I've noticed that they hardly come
around when the dog is out there. The cats also can't go for our usual
walks with me in the evenings because the dog will scare them. I
suppose I should mention that the guy's previous dog did not bark at or
scare the cats.

My cats have been around years before the guy got the dog. Is it
unreasonable of me to ask that the dog be put back in it's pen no later
than 8pm? It's bad enough that I have to put up with it out there
during the day (it barks and whines). I don't think it's fair to me or
the cats or even the dog to leave it out there during the night.

The guy can't understand why I don't want the dog out there. So I can't
tell if I'm being unreasonable or not. Any thoughts?