CREATE TABLE table_28473 ("Character" TEXT, "Played by" TEXT, "Season 1" FLOAT, "Season 2" FLOAT, "Season 3" FLOAT, "Season 4" FLOAT, "First Appearance" TEXT)

How many season 3 appearances by Morgan the Dog?
SELECT MAX("Season 3") FROM table_28473 WHERE "Played by" = 'Morgan the Dog'
SELECT MAX("Season 3") FROM "table_28473" WHERE "Played by" = 'Morgan the Dog'