No, states do not have a system to certify assistance animals, including emotional support animals (ESAs) and service animals, and there is no federal certification process either. However, a health provider can recommend an assistance animal based on a disability and issue an ESA letter or other documentation for their patients.
It's important to note that there are websites that advertise "registering your animal" and sell documents for assistance animals to anyone who answers certain questions, participates in a short interview, and pays a fee. According to HUD (page 11), such documentation from the internet alone is not sufficient to reliably establish that an individual has a non-observable disability or a disability-related need for an assistance animal.
For further guidance on housing accommodations for assistance animals, please check out the article on reasonable accommodations or contact our support team.