My dog had no energy and could move a lot because it was painful and he couldn't eat near to the end of his life, when he drank water he'll throw it back up. Poor baby. He got put down yesterday because he had a tumor on his liver. DON'T LET THAT HAPPEN TO YOUR DOG! :'( Take him to a vet.
good luck
A dog who won't eat for 2 days and just lies down and won't move feels very very sick.
Is he drinking? Try to get him to drink if you can. If he doesn't get fluids he is in danger from dehydration.
Get him to a vet as soon as you can. I wouldn't wait any longer.
I would take him to the vet as both my dogs did this and both cases are not good we almost lost lucy and we are still trying to hold on to billy. If he starts vomitting or has diahhrea then he needs a vet asap