Liz Buchanan BVSc MRCVS
However, it sounds as though a second problem has developed, which may be connected but doesn't have to be. This is the potential polydipsia (drinking too much). Your vet can easily tell whether your dog is over drinking by testing a sample of urine. There are many possible reasons for it, including - if she has a womb - pyometra. Drinking a lot combined with lethargy, particularly in an entire (not speyed) female, may therefore be an emergency and you should contact your vet right away.