Tenants with Service Animals and a no pet policy

[Brett Schickler]

Hello, 

Please forgive me if this is common knowledge. But I'm still learning and I want to stay compliant with a fair housing laws and regulations. I'm an investor in upstate NY I have a vacant unit and a friend sent me a referral for a prospective tenant. After speaking with this individual they seemed like a good fit from my initial phone screening (I still have to do a complete screening and background check) except he told me at the end of our conversation that he has a dog (Micro bully, pitbull mix). I do not want pets in my units as I've had bad experiences in the past and being a multi unit property I'm nervous about my other tenants. I told him I do not except pets. He then told me that this dog WILL be a service dog and he's working on getting all the dogs documents to become a service animal. My question is, do I have to accept this tenant with a potentially dangerous breed? If so, I'm I allowed to ask for documentation proving the potential tenants dog is indeed a service animal? Or should I let the individual apply and try and find something else that disqualify him tenancy in my property? 

Thank you for any feed back