The study evaluated the effect of constant rate infusion of tramadol-xylazine and pentazocine-xylazine on pain in dogs undergoing digital amputation. Twelve mongrel used for the study were randomly assigned to four groups (n=3). Group 1 received loading dose (LD) Xylazine (1mg/kg IV) and Pentobarbitone sodium (Na) (30mg/kg IV) [LD-XP] prior to digital amputation (DA).Group 2 received LD-XP andXylazine (1mg/kg/hr) by constant rate infusion (CRI IV) prior to DA. Group 3 received LD Xylazine (1mg/kg IV), Pentobarbitone Na (30mg/kg IV), CRI Xylazine (1mg/kg/hr) and Tramadol (1mg/kg/hr) prior to DA. Group 4 received LD-XP, CRI Xylazine (1mg/kg/hr) and CRI Pentazocine (1mg/kg/hr) prior to DA. Results of the pain score evaluation showed that at 1, 3, 6 and 24 hours post-surgery (PS), group 4 had the lowest (p
Key words: pain, tramadol, analgesia, multi-modal, pentazocine, xylazine
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