Do you think I should to move out without saying anything
What happened? What makes you want to move out without saying anything?
I'm tired of his mother's dog shitting all over my place
I understand that you're miserable but you should still inform them that you're leaving. Frankly they shouldn't get upset because what you're dealing with is disgusting and no person should have to live with that.
That's what I am thinking. It is too much and the smell is disgusting.
It's fine if you want to leave. Just be aware if you have any prior relationship with these people than leaving without telling them could ruin your relationship.