Under normal circumstances, dogs' eyes will not be continuously red or crying. If the dog's eyes are red, there are four main reasons to consider. First, it is physiological factors, which are related to the dog itself; second, it is pathological factors; third, it is parasites; and finally it is caused by trauma. The treatment method can be considered to clean the eyes with normal saline, and then add antibacterial eye drops.

1. Physiological factors

Dogs sometimes have red eyes after a lot of exercise. This is because the dog has just finished exercising blood is full and the eye pressure is high. There is no need to panic in this situation, and it will be relieved after the dog is resting.  

2. Pathological factors

One of the dog's eyelids are inverted or inverted eyelashes. The inverted eyelids or eyelashes are expensive to stimulate the eyes and make the eyes cry and red. This problem is best solved through surgery; the other is that the dog's eyes are infected by bacteria, viruses or parasites. At this time, the dog will be irritable and restless, rubbed his face with the ground, and scratched his head with his paws. This may be that the dog has developed eye diseases, such as conjunctivitis, keratitis, etc., and needs medical attention in time.

3. Parasites

When there are parasites in the eyes of dogs, their eyes will become red. In this case, seek medical treatment in time, clean the eyes, and deworm them well.

4. Trauma

When a dog suffers trauma, one is eye trauma, such as tickling in a fight, or accidentally a foreign object enters the eye, the eyes will also be red, considering whether there is eye bleeding; the other is head injury, when the intracranial pressure is too high, not only will the eyes be red, but also the eyeballs are bulging.