One hundred and forty-two dogs with single or multiple pseudopregnancies were treated with bromocriptin at three different dose rates and once in combination with mobilerone. The treatments that scored best were 30 micrograms/kg bromocriptin for 16 days and 10 micrograms/kg bromocriptin for 10 days. Vomiting was a frequent side effect (about 20 per cent of cases) and was treated successfully with metoclopramide at a dosage of 0.5 mg/kg. Metoclopramide had no effect on the effectiveness of the bromocriptin.