Though there are no federal laws that state a person can only have one emotional support animal,
It is very rare that a therapist would agree to approve more than one ESA. This is mostly due to the fact that it is extremely difficult to justify more than one animal being clinically necessary. Additionally, airline companies and housing authorities seem to push back hard if there is more than one ESA. With that said, therapists are willing to consider a second ESA on a case-by-case basis. If approved for a first ESA, a client then has the ability to request a clinical review for a second animal.
You can apply for an evaluation for a second ESA through your CertaPet platform after the and if the first one has been approved. The cost is $99.99 and the turnaround time is 2-3 business days. If the mental health professional does not recommend a second ESA you will receive a refund minus a 35 dollar service fee for the consultation.