Dogs lose water daily when breathing and panting through evaporated saliva. Although this can easily lead to dehydration, it is rarely a cause of alarm. Puppies are more susceptible to dehydration compared to adult dogs because they have less body mass.
Dogs lose the majority of body water during urination hence why their water bowls should be constantly replenished frequently. Concentrated puppy urine, with a strong pungent smell is one of the signs that your dog is not taking enough liquids. Puppies drink more water during hot days compared to rainy days but make sure they have water even on cold days.