When it comes to gauging how happy your snails are, there are a few key signs that you can look for. Firstly, healthy snails will be active and dart around their environment. They should have plenty of access to food such as vegetables and fruits as well as calcium-rich sources like cuttlebone so they can keep their shells strong. An enclosure with plenty of hiding spots is also important because it provides them the chance to retreat from the light if they wish too. If your snail spends most of its time out in the open or exploring then this is usually a good sign! Additionally, watch out for any changes in their behavior or appearance which could indicate something else may be wrong. Lastly, make sure you’re regularly cleaning and maintaining their tank/enclosure; when kept clean, snails tend to be much happier than when living in an unclean environment full of bacteria!