Dogs can't open their eyes.

In fact, there are many reasons why dogs can't open their eyes, mainly: 1 Eye diseases (bacterial and fungal infections can lead to conjunctivitis and keratitis). 2. Congenital lacrimal gland obstruction. 3. Eat too much spicy and salty food. 4. Dog eye injury: foreign body stings eyes, or abnormal eyelash growth stimulates eyes.