Unless you REALLY know turtles, the only way to know for sure if it's healthy is to take it to a knowledgeable turtle vet. Your photo is kinda fuzzy but the top shell doesn't look too bad from a distance. That's not much to say though. Any unsymetrical spots on shell? Does it have runny eyes or nose? Parasites could be in stool whether you see them or not. Being a rehabber, I examine turtles over a period of time to judge health for sure. Sometimes respiratory infections take a while to show up. My experience shows that most turtles have worms also. Always quarantine a new turtle for 3 months before putting in with any others. If this turtle has been kept strickly inside or will be kept strickly inside, you more than likely will have problems with it sometime. For good care info. visit: http://www.gctts.org/
