Merlin's Acting Weird....

Any neighbors not like them? Im assuming hes the dog in your picture and if a neighbor was to have kicked him or something that might explain the no go on a rollover and they might have hit the other dog and its muzzle was still sensitive. It sounds crazy but that might be a possible reason for his pain and whinning plus no food or drink. If he still isnt eating or drinking give him gatorade. Thats what we do when our animals get parvo and have to get some electrolytes back in their system. Its like pediasure for your kids except for dogs lol