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A combination of niacinamide and tetracycline was used to treat 31 dogs with various autoimmune skin diseases (discoid lupus erythematosus, pemphigus foliaceus, pemphigus erythematosus, and bullous pemphigoid). Of the 20 dogs with discoid lupus erythematosus, 70% had excellent or good response to treatment. Serious side effects were not noticed in any dog.
Canine atopy is a common dermatologic disorder. Because the disease most frequently strikes young dogs, lifetime management strategies are necessary. Consideration must be given to the treatment of pruritus and secondary manifestations of the allergy, such as pyoderma, otitis externa, and seborrhea, to manage these patients successfully. The use of glucocorticoid therapy and hyposensitization are discussed.
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There are several problems associated with the radiographic diagnosis and assessment of intervertebral disc disease in the dog, including both technical matters and image interpretation. The purpose of this chapter is to discuss some of the problems and offer possible solutions. These will become dated in the future as newer methods of imagery (e.g., magnetic resonance imagery and computed tomography) and newer contrast agents become more available in veterinary medicine.
During the autumn of 1988 an outbreak of canine infectious tracheobronchitis, which seemed to be more infectious than usual, occurred throughout Scandinavia. Paired serum samples and bacterial swabs were collected from 52 dogs with clinical signs of infectious tracheobronchitis in three districts of Norway. The results revealed a fourfold or greater rise in the titre of antibodies against canine parainfluenza virus in 79 per cent of the cases, strongly suggesting that the virus was of aetiological importance in the outbreak. Bordetella bronchiseptica was not isolated from the diseased dogs, and they showed no rise in the titres of antibodies against influenza virus, reovirus or adenovirus.
Forty-one cases of infiltrative urethral disease in female dogs were reviewed. The cause was epithelial neoplasia in 29 dogs, granulomatous (chronic active) urethritis in 10 dogs, and leiomyoma in 2 dogs. Clinical signs of disease were similar in dogs with neoplastic and inflammatory disease and included strangury (36/41), hematuria (30/41), pollakiuria (20/41), vaginal discharge (16/41), and complete urinary obstruction (7/41). Results of aspiration biopsy of the urethra correlated with those of surgical biopsy in 11 of 15 dogs. In 4 of 15 dogs, results of cytologic and histologic examinations differed. Granulomatous (chronic active) urethritis is an infiltrative urethral disease in female dogs. Clinical findings are similar, but the prognosis is more favorable than that in dogs with urethral epithelial neoplasia.
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In summary, previous attempts to explain the role of inheritance in autoimmune disorders through family studies have been hampered by the variable degree of phenotypic expression. Our evidence utilizing dogs in family studies is consistent with the concept that genetic factors play some role in determining disease susceptibility. Recognizing the complexity of the genetic components involved in these studies, we have proposed a hypothesis of two classes of genes, one that relates to immunoregulation and another that specifies pathologic lesions (and thus the clinical signs). This dual system of interacting genes provides a rational explanation for many of the observations previously encountered in both human and canine studies.
Colonic perforation after corticosteroid and surgical treatment of intervertebral disk disease in a dog Perforation of the distal segment of the descending colon, after corticosteroid and neurosurgical treatment for an intervertebral disk herniation, resulted in the death of a 3-year-old, male, Lhasa Apso. Initially, the dog was paraparetic in the hindlimbs, but became paraplegic after 4 days of conservative treatment. Corticosteroids were administered before referral and during decompressive hemilaminectomy. Six days after surgery, the dog had improved neurologically, but was depressed, anorectic, and vomiting. Abdominocentesis revealed septic peritonitis. The dog died shortly after a perforation in the descending colon was surgically corrected.
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Dorsal laminectomy was used to treat 30 dogs with cervical intervertebral disk disease. A variety of breeds were represented, and all animals weighted 15 kg or less. Myelography was utilized to locate each solitary disk herniation. All 30 cases progressed to complete recovery which indicates that dorsal laminectomy may be performed with success in small dogs with intervertebral disk disease.
Thromboembolic disease and progression to disseminated intravascular coagulation (DIC) are potential life-threatening complications for dogs with nephrotic syndrome. Platelet count, prothrombin time (PT), activated partial thromboplastin time (APTT), plasma concentration of fibrinogen degradation products (FDPs), antithrombin III (ATIII), protein C, and plasminogen were used to identify hemostatic abnormalities in a dog with nephrotic syndrome. Pulmonary thromboembolic disease was diagnosed by thoracic radiography, arterial blood gas analysis, and pulmonary scintigraphy. Prompt recognition and treatment of hemostatic complications is necessary in dogs with nephrotic syndrome.
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Cruciate disease is a common cause of chronic lameness in dogs. Midsubstance rupture of the cranial cruciate ligament (CCL) arises from progressive pathological failure, often under conditions of normal loading in adult dogs with CCL instability. A high risk of rupture is associated with inflammation of the synovium and adaptive or degenerative changes in the cells and matrix of the CCL. In contrast, CCL rupture in puppies is usually associated with traumatic injury and avulsion of the CCL from its sites of attachment.