The Grooming Station is a domed, open-sided hut containing a pool of water and a rotating rock wheel. The roof is depicted as shingled with green tiles. In the game, Dragons: Rise of Berk however, there is no pool of water, and there appears to be hot coals or fires underneath the roof.
The Dragon Grooming Station is a building for dragons to care for themselves. They can bathe, exfoliate, and possibly dry off over hot coals.