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The femoral head is the ball part of the hip joint and if it develops necrosis or dies, it can no longer function properly. Necrosis is due to loss of the blood supply to the femoral head, which may be the result of a growth abnormality or trauma to the hip. It is a hereditary condition of small breed dogs. The most common clinical signs are slowly progressing hind limb lameness with a resulting inability to bear weight on the affected limb or both hind limbs. Diagnosis is made by radiographs of the hip joint. The treatment of choice is femoral head and neck ostectomy, which results in a good prognosis.
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This handout discusses lens luxation in dogs. The lens is the transparent structure within the eye that focuses light on the retina. Lens luxation is when the support ligaments of the lens weaken or break, causing the lens to dislocate from its normal position. The various types, clinical signs, heredity of the condition, diagnosis, treatment, and prognosis are outlined.
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Lumbosacral disease, or cauda equina syndrome, is caused by the narrowing of the spinal canal and results in compression of the spinal nerve roots; pressure on the nerves that exit the spine cause the clinical signs. This pressure may be due to a narrowed spinal canal caused by arthritis, intervertebral disc herniation, an infection in the disc, trauma, congenital malformation, or a spinal tumor. Dogs with lumbosacral disease are in pain. If the clinical signs and radiographs suggest lumbosacral disease, advanced imaging such as MRI or CT is recommended to make a diagnosis. Treatment involves either conservative medical treatment or surgical intervention.
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A luxating patella is a kneecap that moves out of its normal location, causing an affected dog to skip or hop on three legs. Many toy or small breed dogs, including the Maltese, Chihuahua, French Poodle, and Bichon Frise, have a genetic predisposition for a luxating patella. Surgery should be performed to prevent the development of arthritis or another knee injury.
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There are several different types of malignant mammary tumors, with carcinomas being the most common. Carcinomas arise from epithelial (skin) cells, tubules of the mammary glands, or other cells found in the mammary chain. The size of the masses and their appearance may vary, but they are usually firm and nodular. Occasionally, the skin over the mass may ulcerate (open) and bleed, and the affected area may feel warm to the touch and become painful. Detecting and treating these tumors when they are small, and before spread has occurred, will provide your dog with the best chance for long-term control.
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Mast cell tumors are most common in the skin of dogs and may appear red, ulcerated, or swollen. They can be itchy and can fluctuate in size. Tumors can range from lower-grade, with minimal spread, to higher-grade, with a high risk of local invasion. Treatment usually involves surgical removal and may require supportive treatment including chemotherapy, radiation therapy, and therapy to target the mutation that instigated the tumor.
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Muscle tears are direct or indirect traumatic injuries that cause damage to muscle tissue. The most common cause is an indirect injury, or strain, caused by overstretching during athletic activities, such as running or jumping. This handout discusses muscle tears in dogs and reviews the causes of these injuries, the clinical signs, diagnostic testing, therapy, and expected prognosis.
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Osteochondritis dissecans is an inflammatory condition that occurs when diseased cartilage separates from the underlying bone. It most commonly affects the shoulder joint but the elbow, hip, or knee (stifle) may also be involved. This is a developmental disease that occurs in rapidly growing large breed dogs typically between 6 and 9 months of age and tends to occur more often in male dogs. Dogs that are affected with OCD typically limp or are lame in the affected leg or legs. Several radiographs of each affected leg are necessary to get an accurate assessment of various bones and joints. Treatment may involve conservative medical management or surgical intervention.
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Rarely, ovarian tissue can be left behind when a dog is spayed. This leads to the ongoing secretion of hormones such as estrogen and progesterone that can result in a dog continuing to have a heat cycle. Ovarian remnants are difficult to diagnose, but vaginal cytology combined with hormone testing can be used to confirm the presence of functional ovarian tissue. Surgical treatment is typically recommended to prevent other health conditions from developing.
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Patent ductus arteriosus (PDA) is a heart defect that occurs when the ductus arteriosus (an opening between the aorta and the pulmonary artery) fails to close at birth. A PDA is usually diagnosed when your veterinarian hears a continuous heart murmur during a routine physical examination of your puppy. This article explains PDA and discusses signs, treatment, and prognosis for this condition.