Polyuria (frequent urination) can be due to several things. First, polyuria with polydipsia (frequent drinking) are common signs of Diabetes - the dog drinks a lot of water to replace the water he is losing through urination to get his blood sugar down. Second, polyuria can be due to kidney or bladder issues, from infection to cancer. Third, polyuria can be a sign of systemic disease.
I would suggest taking your dog to a veterinarian for an examination - none of the above situations are going to get better on their own, and several can get severe enough to cause death if not treated.
Could be low blood sugar or diabetes
The medical term for a hormone disorder causing excess thirst and high blood glucose levels is diabetes mellitus. It is a chronic condition where the body either does not produce enough insulin or does not use it effectively, leading to elevated blood sugar levels and symptoms like increased thirst.
Diabetes, both type 1 and type 2, can cause excessive thirst and urination. This is due to the body's inability to properly regulate blood sugar levels, which results in increased urination to remove excess glucose from the body, leading to dehydration and increased thirst.
Most likely, dehydration
Dehydration causes thirst.
Ingesting an excess amount of the herb can lead to vomiting, dizziness , thirst, and nosebleed.
insulin
One of the symptoms of diabetes is increased thirst.
Many different conditions can cause excessive thirst. Diabetes will cause this, as well as eating foods that are heavily laden with salt.
It causes you to hallucinate.
ADH
what causes due to Chromium as a contaminant in drinking water in excess of permissible levels