Upvote:3
Dubai International (DXB) airport has 3 terminals. Terminal 2 is used by Flydubai and a few other budget airlines whereas Terminals 1,3 are used by Emirates and other major airlines. Coming to your questions.
Dubai International: Use our complementary shower facilities located on the departures level of Terminal 3 (between gates C18 and C22) and (between gates B13 and B19 and between gates A1 and A24).
Apart from your questions, the airport will have restaurants, sleeping lounges, charging booths, restrooms, smoking areas, shopping areas, currency exchanges, WiFi and a number of other facilities. I would strongly suggest to take some local currency (AED) with you instead of using the airport currency exchanges.