This study compared the postoperative analgesic effects of electroacupuncture, morphine, and sham acupuncture in dogs undergoing mastectomy. Thirty dogs were divided into three treatment groups. The results showed that the group receiving electroacupuncture required the least amount of rescue analgesia after surgery compared to the morphine and sham acupuncture groups. The study concluded that electroacupuncture reduces postoperative analgesic requirements and provides effective pain relief in dogs after mastectomy.