Ophthalmologic examination of 72 Bouvier des Flandres dogs revealed variable degrees of goniodysgenesis in 37.5% of the animals. All dogs examined were normotensive and asymptomatic. Tonography in 4 dogs showed normal c-values for out-flow facility in all of them. Pedigree analysis demonstrated a recessive inheritance. Although the frequency of goniodysgenesis appears to be very high in this breed, the incidence of glaucoma remains low. Genetic counseling and careful selection of breeding stock showed that gonioscopically normal animals can be produced.