Board Thread:Questions and answers/@comment-75.131.55.114-20171001141938/@comment-2602:306:B82A:AA30:98FE:FAA1:53C8:E76C-20171001231557

The people you're seeing started the game long before you when all the seasons were available in one app. You started too late and now have to play them in separate apps. Therefore, they have the ability to use their pets across all seasons while you can only use the pets for that season.