I'm just gonna say this and then will leave the matter entirely alone. First....it's quite probable that the guy who does the repairs neither knows nor cares what the details are of any given lease. He does his job and so long as he doesn't see any blatant, major property abuse, he wouldn't say anything to the landlords.

This is coming from someone who owns properties and rents them out. If I, as the property owner, were to ever find out that one of my tenants were breaking the lease in this manner, they would be given two weeks to remove every single animal AND get the property thoroughly cleaned and sanitized and repaired as needed....OR...they would find themselves in eviction court.

It's easy to feel like you're skating safely when the ice is smooth...but you never know when you'll hit that thin patch and the whole lake crumbles beneath you.