“…We chose to compare ketamine used alone (Ketaset; Southampton, Hants, UK) with ketamine combined with medetomidine (Domitor; Pfizer Limited, Sandwich, Kent, UK) and butorphanol (Torbugesic; Southampton, Hants, UK). Medetomidine-ketamine-butorphanol (M K B) combinations were chosen because of their apparent popularity and efficacy for minor operations in domestic mammals in the UK (Hedenqvist et al (2001). Medetomidine is a potent a 2 -agonist and produces dose-dependent sedation and analgesia that appears to operate synergistically with ketamine (Wolfensohn & Lloyd 1998;Bush et al 2001).…”