PentobarbitalGABA ModulatorsHypnotics and SedativesBarbituratesAdjuvants, AnesthesiaAnestheticsChloraloseEuthanasia, AnimalReceptors, GABA-AAnesthesiaDiazepamXylazineKetamineThiopentalIsofluraneHalothaneUrethaneDogsgamma-Aminobutyric AcidDose-Response Relationship, DrugChloral HydrateAnesthetics, GeneralEtherDextroamphetamineChlordiazepoxideAnesthesia, IntravenousSecobarbitalGABA-A Receptor AgonistsReinforcement SchedulePregnanedionesEtomidateColumbidaePropofolPicrotoxinGABA AgonistsAnesthetics, InhalationTriazolamPhencyclidineGABA-A Receptor AntagonistsAminobenzoatesEthoxzolamideAnesthetics, IntravenousMeprobamateAnesthetics, DissociativeSorboseHexobarbitalRats, Inbred StrainsRats, Sprague-DawleyBrainDrug InteractionsMuscimolDiuretics, OsmoticDiscrimination Learning