Twelve dogs were randomly distributed in two groups of six animals and treated as follows : control group ( X-IM ) : 1mg kg ( -1 ) of xylazine given intramuscularly ( IM ) ; pharmacopuncture group ( X-Yintang ) : 0.1 mg kg ( -1 ) of xylazine diluted to 0.5 mL of saline injected into the Yin Tang acupoint .