Emotional Support Animals Questions

[Jason Crowe]

I have been notified by a tenant that ive had for a while that they have designated a pet a Emotional Support Animal.  Is this allowable even after being in a lease?  Can the tenant have multiple animals under this regulation?  Im unfamiliar with this fair housing rule and wondering who out there has had experience and could expand on the subject.  What are the landlords legal rights to ensure this doesn't go overboard and get out of hand?