Hi again, it is possible that this is a physical problem if your dog has not shown many other behavioral changes. The next step in the investigation is probably to measure water intake and keep a urination diary for about 3 or 4 days. If you fill the dogs water bowl with a known amount of water and then measure what is left after 24 hours keeping track of water intake isn't too tricky. You can then give this give this information along with the weight of your dog and preferably also the dogs daily energy intake (easy if your dog is on kibble because its on the back of the bag) to your vet and they can calculate (usually just over the phone if you do not want to try a full consult although a good check up is advisable if your dog hasn't had one recently) if the dogs daily water intake is excessive. Excessive urination and drinking (known as polyuria, polydypsia) is a symptom of many various illnesses and so its important to check whether one of these could be the cause of the dogs toileting problem.
In the mean time keep letting the dog out to the toilet as many times a day as possible and try spraying common urinating spots with urine deodorizer to discourage re-use of these locations. Hopefully we will have some more clues once the drinking and urination has been monitored for a while.
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