What are some of the signs of early renal disease in the dog and cat?

The kidneys remove excess water and waste from the blood. But kidney function diminishes slowly and steadily with age. In older dogs and cats, kidney failure is a leading cause of illness. Damaged kidneys are less able to concentrate urine, so the body needs more fluid. Hence, increased thirst and urination are often the first signs of kidney disease.

As the disease progresses, pets lose weight and appetite. They play less, sleep more, and may exhibit constipation and nausea. By the time most owners notice these changes, most kidney function is already lost. There is no cure for chronic kidney failure. But your veterinarian can help slow its progression and improve your pet's quality of life.

– Dr. Larry McDaniel, DVM for the “Purina® Animal Instincts” Podcast Series

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