dog symptoms

What are some symptoms of the disease the dog?
My 16 years of dog springer year / laboratory has not been drinking much water still is having excessive drooling and his eyes are watering. This is a dog that eats everything that is on their feet, but has been acting very strange and be demanding with his food.He is just acting weird, etc, etc confused not go outside and potty just pottys wherevere hes in it and has not been much use of the potty. Any suggestions on what this might Beor what is happening?
At the ripe age of 16 years, these symptoms may be caused by a problem macrocarpa. The breach of any of the major organs – kidneys, liver, heart, cancer etc.. Diabetes. Many possibilities, many, although probably all will lead back to one thing: just of age and these are the things that really make the old dogs. But do not let him suffer.
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