The ergot derivative Hydergine was compared with apomorphine as an injectable emetic for dogs. A simple crossover study using 19 mixed-age animals of different breeds and sexes indicated that apomorphine was more consistent in effect and had a shorter latent period. It was concluded that in circumstances demanding emesis in the dog, apomorphine remains the drug of first choice, but should it become unavailable, Hydergine would be a possible alternative.