I have an 6-10 year old lab mix that was diagnosed with HGE last night. He was vomiting and had bloody diarrhea all day yesterday. I took him to the vet and they gave him some IV fluids to take the edge off the dehydration but I couldn't afford to leave him there all night. We're home and started the medications but he doesn't want to drink. I'm afraid he'll get worse if he doesn't drink more, how can I get him to drink?