I have a 5 month male Holstein. I found him in the pasture 2 days ago weak and lethargic. He was not coming to the water trough and he was completely dehydrated, I have been giving him lots of fluids with electrolytes, some microbial gel. He's getting grass, hay and a high protein sweet feed. He has been eating and drinking with encouragement since I brought him into the barn. He does not have diarrhea and is eliminating well but he will not stand. He is lying on his left side and I can not get him to stand or change positions. I was hoping he was just dehydrated but now, I'm worried that it is something worse. Any advice?