@Alicia787 If it's a true service animal then you shouldn't have any issues, other than dog hair, as service animals are highly trained and don't do things like chew things up, bark uncontrollably, relieve themselves indoors, etc.
ESAs are another story, as anyone can claim Fido is their ESA even if it's an untrained puppy.
The issues most hosts encounter is guests lying about their animals.
You can mitigate this somewhat by sending guests a copy of the Airbnb policy re service animals and ESAs, if they tell you they are bringing one- that they have to be housebroken, that they can't be left alone, etc. That may head off the ones who are lying.
If they simply show up without disclosing the animal when booking, then you can send them the policy at that point, especially if you have reason to suspect it's just a pet.