Overview of Canine Entropion
Entropion is an inward rolling of the eyelid edges. This is a common eye problem and can be present soon after birth or acquired later in life. It most commonly affects the dog’s lower eyelids.
Entropion that is considered to be inherited usually develops within a few months of birth. It occurs in a wide variety of purebred dogs, including the chow chow, English bulldog, Irish setter, Labrador retriever, St. Bernard, Chinese shar-pei, golden retriever, Great Dane, and Chesapeake Bay retriever.
Entropion may also develop later in life secondary to other changes around the eye. It can arise from spasm and pain associated with corneal and other eye diseases. It may occur when the eye itself moves backwards into the orbit (enophthalmos), or when the eye becomes shrunken following a severe injury or infection. Occasionally entropion develops following loss of normal neurologic function of the eyelids.
Entropion can occur alone or may be accompanied by other eye problems such as abnormal eyelashes, corneal ulcers and scarring, and ectropion (outward rolling of the eyelid). Since entropion is the inward rolling of the eyelid, the hair on the affected lid continuously rubs against the cornea. This can cause significant discomfort and trauma to the cornea.
Entropion most often affects the outer aspect of the lower eyelids of one or both eyes. The upper eyelids may also be involved. In some dogs the entire eyelid is rolled inward, or a portion of the lid may be rolled in and another portion is rolled out.
What to Watch For
Diagnosis of Entropion in Dogs
Diagnosing entropion is done by a thorough ocular examination.
Treatment of Entropion in Dogs
There is no medical therapy to correct the entropion itself; surgical correction is necessary. An important part of surgical correction of entropion is to make sure your veterinarian has experience in these procedures. Overcorrecting entropion can have serious repercussions. The eyelid may then roll excessively outward or may not be able to close completely. Both these complications can result in irritation of the cornea, and may require either further surgery or a lifetime of protective eye medications.
Based on the severity of the entropion, breed and age of the pet, different surgical techniques may be used.
Occasionally tacking is performed as a temporary procedure to help in the healing of corneal ulcers, and to try to resolve entropion that has developed secondary to the spasm caused by the pain of the corneal ulcer. It is rarely performed in dogs older than 6 months of age.