I'm going to message my landlord about my roommate bringing over his uncle's dog
Why do you want the landlord to know about the dog?
He just moved his dog into my home and it craps all over the house. I don't want to clean that up.
If dogs aren't allowed, you should let your landlord know. You have every right to do that.
I don't like people and I'm going to irritate the dog until it bites my roommate.
It right to report a ciolation of the lease. Just be sure to not do anything to aggravate the situation more.