Longitudinal B-mode ultrasonographic view of the caudal aspect of the proximal vagina of a 1-year-old sexually intact female Labrador Retriever that was evaluated for a 4-day history of brown, malodorous vaginal discharge, vomiting, and a fever. Notice the echogenic fluid present within the vaginal lumen. The vaginal wall appears moderately thickened (arrows), which is just ventral to the hyperechoic region denoting fecal material within the colon (arrowheads). The image was obtained transabdominally with a 6-MHz linear transducer.