Longitudinal B-mode ultrasonographic view of the cranialaspect 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 focal thickening of the caudodorsal aspect of the cervix measuring 2.5 × 3 cm (plus signs). The image was obtained transabdominally with a 6-MHz linear transducer.