Group `` Control '' received 0.1 mL/kg saline SC 30-45 minutes before hydromorphone , group `` Marop1 '' received 1 mg/kg maropitant SC 30-45 minutes before hydromorphone , group `` Ace '' received 0.02 mg/kg IM acepromazine 30-45 minutes before hydromorphone , and group `` Marop2 '' received 1 mg/kg SC maropitant concurrently with hydromorphone .