MedetomidineAnalgesicsXylazineAdrenergic alpha-AgonistsAnalgesics, OpioidZolazepamTiletamineHypnotics and SedativesAnalgesics, Non-NarcoticAnesthetics, CombinedAdrenergic alpha-2 Receptor AgonistsButorphanolAnesthetics, DissociativeKetamineGuaifenesinMethotrimeprazineImidazolesAcepromazineSurgery, VeterinaryVeterinary DrugsAnalgesiaRespiratory RatePainDexmedetomidinePain MeasurementFentanylMidazolamAnestheticsImmobilizationAnesthesia Recovery PeriodReceptors, Adrenergic, alpha-2MorphineDose-Response Relationship, DrugAnesthesiaAdrenergic alpha-AntagonistsPain, PostoperativeReceptors, Biogenic AmineCardiovascular SystemTramadolDogsPhenacetinInjections, IntramuscularShrewsAcetaminophenPropofolHeart RateRespirationRandom AllocationAnesthesia, Intravenous