Thanks for the additional information. It is helpful.
It sounds like your dog has a urinary tract infection. Common symptoms of a urinary tract infection are frequent urination, dribbling urine, blood in the urine, squatting frequently to urinate, strong odor to the urine, inappropriate urination and straining to urinate as well as an increase in fluid intake. Often the urine will be pale due to the amount of fluids being drank.
A dog with a UTI does not always show all the symptoms and typically displays 2 or 3. I believe you need to have your Vet check your dog out so it can get medication for the problem if your dog is displaying 2 or more of the above symptoms..
Other causes for increased thirst and frequent urination include kidney failure, diabetes mellitus, cushing, and liver disease to name a few. You can read about this here:
I asked some of those other questions because some dogs experience something like Alzheimers in humans called Cognitive Dysfunction Syndrome (CDS) and has been seen in dogs younger than your dog. There is a wonderful site that explains it well and also explains how to document your dog's behavior and discuss it with your vet. The good news is that there is a drug called L-Selegeline (Anipryl (R)) which has been recently approved for use in the clinical indication of cognitive dysfunction (CDS) in dogs. Read this site for other drug choices.
Please see this site for more information and other causes that may exhibit the same symptoms.
Since he isn't displaying more signs of CDS it isn't as likely as a UTI. He is displaying multiple symptoms of a urinary tract infection. Given his age, I would go ahead and have a senior check up done including an urinalysis and bloodwork to check organ function.
I hope this information is helpful to you. If you would like any additional information or have more questions please don’t hesitate to press the reply to expert or continue conversation button so I can address any issues you still have . If you do find this helpful, please take this opportunity to rate my answer positively so I am compensated for my time.