No injections or other unusual health precautions are required for Dubai. The biggest danger most visitors face is the heat. Visitors should drink plenty of water, especially during the hot summer months.
The tap water is safe to drink, although most locals and visitors prefer to buy drinking water.
The heat will result in lot of other problems like food going stale sooner and poor appetite.I would prefer going there when it is little cooler.I think that even moving around will also be easier.Outdoor games and recreation facilities will also be difficult to enjoy in the hot weather.