What is your condo board's policy on service animals? Surely they must have one, and it's recognized that they are the exception to the rule, since they are not 'pets'? As regards Airbnb, the policy is clear on what expectations are regarding assistance animals,
https://www.airbnb.ca/help/article/1869/assistance-animals
A Host may ask a guest to remove a service animal if:
- The animal is out of control and the animal’s handler does not take effective action to control it
- The animal is not housebroken
It doesn't sound like this was a legitimate service dog if it wasn't under the control of the owner.