Well, we figured out what's going on with Sweetie. She's got a rare disorder called Diabetes Insipidus. I copied the following from vetinfo.com.
Diabetes Insipidus
Diabetes insipidus is a disorder in which the kidney is insensitive to a hormone, called anti-diuretic hormone (ADH) or in which there is not sufficient quantity of this hormone available. The result is excessive drinking and urination, or polydipsia and polyuria. This is one cause of changes in urinary habits that leads to problems with urination inside the house in dogs in which "housebreaking" seemed to be satisfactory prior to the disease onset.
ADH is secreted by the body when it has a need to conserve water. It makes the kidneys work harder to conserve water, which makes the urine more concentrated. When the dog can not respond to this hormone or doesn't make enough of it, the dog can not concentrate its urine. This can lead to serious problems, including death, if the dog does not have access to large quantities of water. On the other hand, it may not cause any significant problem if there is always plenty of water available. This problem can occur for a number of reasons and for no reason at all.
I'm not unhappy with this diagnosis. It's good to know what's going on with her, and not really that difficult to manage.
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