Again, the difference between a service dog and an emotional support dog. The laws are different and, albeit loosely, governed by different branches of the law. Service dogs laws are from the ADA, the emotional support dogs would be governed the Fair Housing   Act https://esadoctors.com/fair-housing-act-emotional-support-animals/     It still does not require a landlord to allow a pet that causes a real problem (not cleaning up after a dog's poop on the property, showing aggression and other restrictions as outlined by the FHD). The pet (and it is not limited to dogs) does not require the same extensive training that a service dog does.