My dog was fine yesterday; I suspect a large dog bit its head, and today it vomited, cannot stand, rolls its eyes. It is dying.

A puppy that cannot stand and is confused may relate to these causes. First, injury: if the head is severely traumatized causing encephalitis, it may vomit and struggle to stand, needing hospital CT, MRI, or X-ray for accurate treatment. Second, distemper virus infection causing vomiting, nerve damage, and standing difficulty, common in puppies and needing prompt care.

Third, poisoning damaging nerves. In any case, go to a vet if possible; if not, give glucose or goat-milk powder for nutrition and see if it slowly recovers..