Perineum

The perineum, also referred to as the perineal region, is the area between the anus and the external genitalia of a dog. In the male dog, it lies between the anus and the scrotum; in the female dog, between the anus and the vulva. The perineum consists of skin, muscles and connective tissue and surrounds the openings of the urinary and digestive tracts. It stabilises the pelvic organs and enables control over urination and defecation.

Anatomy of the Perineum in Dogs

The perineum is made up of various muscles and structures:

Muscles: The M. levator ani and the M. coccygeus support the pelvic organs and are involved in defecation and urination.

Connective tissue: It provides additional stability and keeps the pelvic organs in their position.

Nerves: The perineum contains nerves for sensory perception and motor control of the muscles, necessary for controlled defecation and urination.

Function of the Perineum

Support of the pelvic organs: The perineum stabilises the intestinal, urinary and reproductive organs and ensures that they maintain their normal position. It contributes to bowel continence and helps control defecation and urination.

Control of defecation and urination: The muscles in the perineum control the sphincters of the anus and urethra, allowing the dog to voluntarily control defecation and urination.

Protective function: The perineum offers protection for anatomically sensitive areas such as the anus and the genital organs.

Diseases of the Perineum in Dogs

Perineal Hernia

A perineal hernia occurs when the muscles of the perineum are weak or damaged and parts of the intestine or other organs protrude into the perineal area through this weakness. This condition is more common in older, intact male dogs.

Symptoms: Visible swelling of the perineum, difficulty defecating, constipation, bloating and sometimes problems urinating.

Treatment: A perineal hernia requires surgical correction to return the affected organs to their correct position and strengthen the perineum.

Perianal Fistula

A perianal fistula is a chronic inflammatory condition in which open, non-healing wounds develop near the anus. This leads to pain and can be exacerbated by bacterial infections. It is more common in certain breeds such as German Shepherds.

Symptoms: Pain during defecation, swellings or inflammation in the perineum, and in severe cases fever and general malaise.

Treatment: Treatment often involves a combination of surgical interventions, antibiotics and anti-inflammatory medications to control the infection and heal the tissue.

Perineal Gland Abscess

An abscess in the perineal glands can be caused by infections or blockages of the glands, which then become inflamed and lead to a painful swelling.

Symptoms: A swollen, often red and painful area in the perineum, as well as difficulty sitting or defecating.

Treatment: Treatment involves draining the abscess, administering antibiotics and, in some cases, removing the affected gland.

Tumours in the Perineal Area

Tumours in the perineum can be both benign and malignant. They can originate from the skin structures, glands or muscles of the perineum and require a precise diagnosis.

Symptoms: Swellings or lumps in the perineal area, pain, difficulty defecating or urinating.

Treatment: Treatment depends on the type of tumour and can include surgical removal, radiotherapy or other therapeutic measures.

Diagnosis of Perineal Diseases

In Switzerland, the diagnosis of perineal problems requires a careful examination by the vet:

Clinical examination: The vet examines the perineum for swelling, pain or wounds. Control over faecal and urinary discharge is also checked.

Imaging techniques: Ultrasound or X-rays can be used to assess the structure of the perineum and the position of the organs, particularly if a perineal hernia or tumours are suspected.

Biopsy: If a tumour or other tissue disorder is suspected, a tissue sample can be taken and examined histologically.

Blood tests: Blood tests can be carried out to confirm infections or inflammatory diseases.

Treatment of perineal diseases

The treatment of perineal diseases depends on the underlying cause:

Surgical interventions: Conditions such as perineal hernias, fistulas or tumours often require surgery to resolve the problem. Surgical procedures aim to restore the normal anatomy of the perineum and stabilise the organs.

Drug therapy: Antibiotics, anti-inflammatory drugs and painkillers are frequently used to treat infections and reduce inflammation. In some cases, special diets may also be prescribed to facilitate defecation.

Aftercare and care: Aftercare following surgery or drug treatment often includes rest, hygiene measures and monitoring of faecal discharge. Regular veterinary check-ups are necessary to monitor the healing process.