We just bought a pair of guinea pigs from a pet store day before yesterday. Today morning one of my guinea pigs was lying lethargically in his cage. We thought he was dead. But then we saw he was breathing. I immediately picked him up and fed him water with my finger but most of it was running down. Yesterday he was perfectly fine, infact he was the energetic one of those two. He has ample food with him all the time and quite cozy. He moves only when we pick him up and isn't drinking or eating. He looks as if he is going to die. I don't know what to do. Pls help.