AveryJennings(G.Hannelius)andTylerJames(LemonadeMouthstarBlakeMichael)arestep-siblingsfromPasadena,Californiawhohateeachotherbutcometogetherinthepilotepisode.Thefamilyfacesanevenbiggeradjustmentwhentheydiscoverthattheirnewdog,Stan(portrayedbylive-actiondogsKumaandMick,andvoicedbyStephenFull),cantalk.OnlyAvery,Chloe(FrancescaCapaldi),andTylerknowhecantalk.Unbeknownsttothefamily,Stanalsohasablog,whichheusestodiscussthehappeningsintheJennings-Jameshousehold.ThechildrenlearnofStan’stalkingabilityinthefirstepisodeandagreetokeepitasecretfromtheirparents,fearingthatiftheworldfindsoutthatStancantalk,hewillbetakenawayandexperimentedon.[2]In"StanTalkstoGran"Bennett’smotherGrandmaJameslearnsStancantalk,butpromisesthekidstokeepitasecret.