Objectives : The main objective of this study was to determine the within- and between-day variability of blood pressure measurement in dogs using an oscillometric device, pet-MAP®. Animals, materials and methods : Five healthy conscious adult Beagle dogs were used. The dogs were presented in a random order for examinations and the investigators were blinded to the dogs. Blood pressure was measured using a standardized procedure. Three investigators with the same level of experience, trained for 1 h with pet-MAP® the day before starting the study, performed 480 blood pressure measurements in 5 healthy conscious dogs on two different days. Results : The within- and between-day CVs for systolic blood pressure were 9.0–10.1% and 12.8–16.4%, respectively. The corresponding SD values were 14.7–16.6 mm Hg and 21.0–27.1 mm Hg respectively. For diastolic blood pressure, the within- and between-day CVs were 10.3–14.4% and 14.2–24.9% respectively. The corresponding SD values were 9.7–13.9 mm Hg and 13.0–24.0 mm Hg.