MedetomidineAnesthetics, DissociativeXylazineAdrenergic alpha-AgonistsZolazepamTiletamineAnesthetics, CombinedHypnotics and SedativesAdrenergic alpha-2 Receptor AgonistsButorphanolAcepromazineGuaifenesinImidazolesKetamineMethotrimeprazineMidazolamAnestheticsSurgery, VeterinaryVeterinary DrugsRespiratory RateAnesthesiaDexmedetomidineAnesthesia Recovery PeriodImmobilizationAnalgesicsDose-Response Relationship, DrugCardiovascular SystemReceptors, Biogenic AmineFentanylPropofolReceptors, Adrenergic, alpha-2Adrenergic alpha-AntagonistsAnesthesia, IntravenousAnesthetics, IntravenousInjections, IntramuscularDogsHeart RateRespirationShrewsRandom Allocation