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What did the research find?The intrarater reliability of ultrasonographic intestinal wall thickness measurements was poor for all intestinal segments except the duodenum, for which the intrarater reliability was moderate.Similarly, the interrater reliability was poor for the duodenum, caecum and jejunum, and moderate for the right dorsal colon (RDC), right ventral colon (RVC) and left ventral colon (LVC).Despite this, the data set's standard deviation and variance were low across all intestinal segments.• How was it conducted?Eight healthy horses with no history of gastrointestinal disease underwent abdominal ultrasonography to measure the wall thickness of six intestinal segments: duodenum, RDC, RVC, caecum, jejunum and LVC.Triplicate measurements were performed in each segment by each of three sonographers with varying levels of experience on three consecutive days.Intraclass correlation coefficient analysis was then used to determine the intra-and interrater reliability of the measurements.• Why is it important?Abdominal ultrasound is widely used to evaluate the intestinal tract of horses.However, despite being a routine examination, data on the reliability of this diagnostic procedure are limited.Although this study identified poor repeatability in ultrasonographic measurements of intestinal wall thickness, the actual variation between repeated measurements was small.These findings support the use of repeated measurements in clinical practice.