Is It Normal For A Dog To Drink Large Amounts Of Water Frequently?

It could also depend on the age and health of your dog.
I would take your dog for a check-up at the vets, dogs can suffer from cystitis as can humans and drinking a lot of water can be a symptom of this. A dog with kidney problems will sometimes drink a lot as will one with diabetes.

A checkup will help determine whether or not your dog merely needs a lot of water or that there isn't some other underlying medical cause for this.

It is best to get it checked out by a professional and thus you can rest assured that you did your best for the dog !

A dog's water intake requirements depend on its individual characteristics and environmental factors. Some such characteristics are size, age, physical activity levels, state of health, the quality and quantity of food, the number of meals a day, climate (dry, moist), etc. obviously in a dry climate the dog will be thirsty more often and hence it will drink more after. Similarly a dog that does rigorous exercise (a Sheep dog) will have more requirements than a domestic pet that does not perform such activities.

An older dog will tend to be more lethargic than a younger one and hence will require less water.
Anyhow an adult dog will know how much water it should drink and when to drink it. As a rule of thumb we can calculate about 50-60 ml of water per each kilogram of body weight of the dog. For example, a 0.5 kg Chihuahua will need approximately 40ml while a German shepherd which weighs 30kg will need 1400ml of water per day.

I know this is old by this point but polydypsia (increased/frequent thirst) and frequent urination can also be possible indications of diabetes.