A 10-year-old intact female Cocker Spaniel weighing 15.3 kg presented with dysbasia. The dog had hyperglycemia and glucosuria at presentation. Neurological examination and magnetic resonance imaging on the following day indicated the onset of cervical disk disease. Four days later, the patient returned due to sudden vomiting and anorexia with severe dehydration. Abnormal laboratory findings included severe hyperglycemia with ketonuria. Plasma progesterone concentration was very high at presentation. She was hospitalized for critical care, and insulin administration with fluid therapy was initiated. Mean blood glucose concentration showed a gradual decline, and hyperglycemia with glucosuria disappeared four days after initiation of insulin therapy. This case demonstrated that high plasma progesterone concentration during diestrus can contribute to development of diabetes mellitus in intact female dogs.

Serial ultrasonography was conducted on Miniature Schnauzer bitches, on purpose to observe the ultrasonographic appearance of normal ovaries and ovarian structures during the estrous cycle. The size of ovaries was increased from on Day-12 (Day-0=ovulation day) to on Day-8 and there was no significantly different between both ovaries. The ovaries were recognized by its proximity to the caudal renal pole and appeared moderately echogenic oval shape with a smooth contour. The size of follicles was increased from on Day-12 to on Day-0 and there was no significantly different between both ovaries. The number of follicles was increased from on Day-12 to on Day-0 and there was no significantly different between both ovaries. The follicles were small anechoic fluid-filled structures in early of proestrus, more increased, and indistinguished from each follicles in late of proestrus. The size of corpora lutea was increased from on Day-0 to on Day-8 and there was no significantly different between both ovaries. The number of corpora lutea was increased from on Day-0 to on Day-38 and there was no significantly different between both ovaries. The corpora lutea were small anechoic cavity and thin hyperechoic wall in early of diestrus, became more hyperechoic, and increased homogenous structures. The results of this study would be useful for differential diagnosis between normal and abnormal structures of ovaries.