Dogs were randomly allocated to be anesthetized twice , with a @-week wash-out interval , by means of @ of @ possible protocols ( propofol -LSB- @ mg/kg -LCB- @ mg/lb -RCB- , n = @ dogs -RSB- , ketamine -LSB- @ mg/kg -LCB- @ mg/lb -RCB- -RSB- and propofol -LSB- @ mg/kg ; @ -RSB- , or ketamine -LSB- @ mg/kg -LCB- @ mg/lb -RCB- -RSB- and diazepam -LSB- @ mg/kg -LCB- @ mg/lb -RCB- ; @ -RSB- ) .