Group `` Control '' received @ mL/kg saline SC @-@ minutes before hydromorphone , group `` Marop@ '' received @ mg/kg maropitant SC @-@ minutes before hydromorphone , group `` Ace '' received @ mg/kg IM acepromazine @-@ minutes before hydromorphone , and group `` Marop@ '' received @ mg/kg SC maropitant concurrently with hydromorphone .