Service Animal Confirmation and Contract Addendum

[Katrina Wallace]

We have a prospective tenant that has two service animals. 

1. How do I confirm that the animals are in fact service animals? 

2. I know that if they are in fact service animals then they are not pets and you can not charge any fee for them. What type of contract addendum do  you include in your lease for service animals to acknowledge that they are there and that if they do cause damage the tenant is still responsible?