Souraya,

Sorry to hear this about Drake. The first thing that comes to
mind would be an infection. Bladder, UTI, etc.? I'm glad he's
seeing the vet tomorrow so you can nip this in the bud & Drake
gets to feeling better soon. As you know, dogs can be sick with
some infection & still manage to act normal in most ways.
Good luck tomorrow for you & the Draker.