At Adopets, all the animals that are visible and which you can visualize their public profiles are available for adoption. Their availability may vary according to the will of the Shelter organization.
Be aware that it also doesn't mean no one has applied to adopt them, but just that they're still eligible for receiving adoption applications.
So in case you're interested in an available pet, don't wait too long to apply. If you do, you can already be too late.