Water leak & angry pit bull

[Jessica Wood]

Overnight the ceiling in the main floor bathroom of our four plex collapsed due to a water leak. We tried to enter the unit above to shut off water and there’s an angry pit bull inside. Lease says no pets. Can’t get ahold of tenant. What do we do now? State - Iowa. Plumber came and went. They weren’t going to go in there. We can’t shut off main water valve since there are 4 other tenants. It seems to be a slow leak. Do we give her notice to get the dog out or evict her?! The tenant below her just moved out unexpectedly.