Most buyers just want to have their dog. When I bought, I only looked at condo that allow pets since my dog and cats are just pets.
The term "service dog" is one that has been exploited. Some people would like to include their pets as service animals because they provide companionship, security, psychological support, etc.
Although I'm not familiar with Century Village, I believe you will likely find that for a service dog to be allowed they will need to be registered and certified as such and provide a like service for a resident/owner.
You'll likely find that the days of making a simple personal disclosure that "my animal is a service animal" are history. The best source of information on this is the Century Village Management company.