Reasons for the dog suddenly hiding in a dark corner:

1. The dog was frightened. Loud noises, explosions, large amounts of blood, etc. will frighten the dog, and the frightened dog will suddenly cower in a dark corner.

2. There is something wrong with the dog’s eyes. After a dog's eyes become sick and inflamed, they can avoid light irritation to their eyes in dark corners.

3. The dog is suffering from rabies. The main early manifestations of rabies are obvious changes in temperament, such as worry or fear, abnormal behavior, and nervousness.

Solutions to the dog suddenly hiding in a dark corner:

1. The owner should patiently appease the dog’s fear and nervousness, and touch its trembling body more often. Hold it in your arms and comfort it.

2. If the dog’s eyes are swollen and the tears don’t stop, you can feed the dog some anti-inflammatory drugs, and use pet-specific eye drops to anti-inflammatory and sterilize the dog’s eyes.

3. If the dog's temperament changes drastically and attacks its owner, it may be suffering from rabies. Do not come into contact with the dog's saliva and send it to the hospital for treatment as soon as possible.