Question about service animals and no pet rules

[Sam Leon]

There have been numerous service animals and ESA threads in the past but I have a unique and specific question.

A friend of mine who is also a landlord and his property is a 6 unit apartment building in Dania Beach, Florida.  He has a no pet policy - no cat no dog no bird no lizard.

So one of his tenants asked if he can keep a dog for about a month, the dog belongs to his sister who is taking a month long cruise and needs him to baby sit the dog.  Of course the no pet rule governs but wait the dog is a certified service animal but not for him or even her...her sister is the current owner of that animal who obviously provided service to someone in need, but her sister has no disability yet the dog is a certified SA.

So does a landlord have to allow a certified SA in a dwelling even the SA does not actually service the tenant?

All discussions I have seen about SA is in the context of both the person and his/her SA in a tandem.