Many older dogs suffer from kidney disease. Try to understand the outcome of the disease and prepare yourself for the worst. Kidney disease ultimately will lead to kidney failure resulting in inefficient filtering of toxins and wastes from blood.
The first stage will be excess thirst and urination.
Next stage is increased fatigue, decreased appetite, and ragged coat texture.
As the disease progresses, your dog may show symptoms of vomiting, diarrhea, and dehydration.
If the disease becomes severe, toxins start to fill up the body resulting in difficulty breathing, anemia, loss of RBC, and the dog will become totally apathetic and feeble.
You can slow down the process by providing him proper care, diet, and medication. You must still accept that an end will come and thank your furry friend for a job well done.