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Depending on the activity level it may vary , but most dogs over 70 lbs drink approximately one ounce to each pound of body weight. IF you think there is excessive intake of water without the activity level to match then you may be looking at a urinary tract infection or bladder stones.
Here is a water chart to help you. http://www.petguide.org/dogwater.htm
I saw a product called Comfortis. It comes in various