My 5 year old, very bouncy lab/collie cross has not eaten or drunk since coming back from a walk on the beach on Saturday afternoon. Expecting him to be back bouncing on Sunday norning, and to encourage him to drink (he likes to either drink out of a river or from a flushed toilet) we took him to the river and he seemed more himself. Having drunk we then went a little further, he sat down and then vomitted all the water he had just drunk. He was taken into the vets and put on a drip for dehydration on Sunday afternoon and was released with easy-to-digest tinned food Monday morning. . All Monday I couldn't get him to eat or drink again (its as if the snell/thought of it makes him ill)and will have to take him back into the vets tomorrow (Tues) morning. He is completely listless, although waggs nis tail when he sees any of the family and chooses to lie by one of us. I feel he's just going to slip away and don't know why. He isn't in pain at all.