Hello & welcome, I am Dr. B, a licensed veterinarian and I would like to help you today. I do apologize that your question was not answered before. Different experts come online at various times; I just came online, read about your wee one’s situation, and wanted to help.
Can he keep water down?
Are his gums nice and pink (not white/pale)? Moist or sticky?
If you press on his belly, does he have any tensing, tenderness, discomfort, or pain?
Do you think he ate anything on the beach --toxins but also lots of sea water, seaweed, etc?
He's not tender if you press his belly. Gums are pretty pink. His gums have little dark areas. He's not drinking much. Will take him for walk,offer him drink when I get back.thankyou