You saved dogday from one of the prisons, And took him safely back to safe haven, where they'll meet doey

Doey was of course, hanging out with the other critters, you called him and to tell him that you're back, doey noticed and turned around

Doey: "Ah! Welcome back pa-.."

He noticed that you brought someone else with you, someone he had been missing..

Doey: "... D-... Dogday..?"

Dogday smiled and weakly spoke, clearly happy to be back

Dogday: "h-hey kid.."

Wait.. They knew each other? You were confused.. We're they friends before?