rabiesrachisradiographragragamuffin (miscellaneous class)ragdollraggierales (respiration)ramrandom bredrandom mutagenesisrangrangyreceptorrecessrecessive generecognitionrectalrectumrecumbentredred blood cells (rbcs)red-lynx pointreflexrefusionregistered catregistered nameregistrarregistrationregistration numberregistration rulesregistryregressionregurgitationrejectionrelapserenalrenal amyloidosisreproductive cellsrespirationrespiratory ailmentsretinaretinal detachmentretinitisretraction (respiration)retricesreversionrexrhagadesrheumatismrhinitisrhinogenousrhinotracheitisrhododendronrickettsrighting reflexrimaringring tailringwormrodent or indolent ulcerrollingroman noseroman profilerootingrooting reflexrosettesrostrumroundwormruddyruffrufinismrumpyrumpy riserrunnerruntrusrussian bluerust or rustiness