Water provocative tests were evaluated in normal and glaucomatous Beagles. Schiotz tonometry was performed before water was administered (50 ml/kg) by stomach tube and for the next 90 minutes. The mean increase in Schiotz tonometric values in normal dogs ranged from 3.1 to 8.6 mm of Hg and in glaucomatous dogs, 7.3 to 19.9 mm of Hg. Beagles with glaucoma had progressive, gradually increased responses to water provocative tests.