These tend to be large-breed, playful dogs that like to amuse themselves by drinking water, or are very active and need to replenish water loss from panting. The most important aspect in deciding if there is a problem is identifying a change in baseline of water consumption. Try to be aware of how much your dog drinks on a regular basis, take note and consult your vet if the amount suddenly increases or decreases. What Should I Do If My Dog is Drinking Too Much?