Which of the following is considered a common sign of kidney disease in animals?

Increased thirst and urination are indeed common signs of kidney disease in animals. This condition, known as polydipsia (increased thirst) and polyuria (increased urination), occurs because the kidneys are not effectively concentrating urine due to impairment. As a result, affected animals may drink larger amounts of water to compensate for the increased urine output, leading to signs of dehydration despite the intake of more fluids.

This symptom is particularly significant as it often alerts pet owners to potential underlying health issues that require veterinary evaluation. Kidney disease can disrupt the balance of various substances in the body, causing these observable changes in drinking and urination habits.

Other options, such as high energy levels, weight gain, and a normal appetite, do not typically align with the clinical signs of kidney disease. In fact, animals suffering from kidney disease often exhibit lower energy levels due to fatigue, potential weight loss due to anorexia, and may experience changes in appetite as the disease progresses. Thus, the presence of increased thirst and urination stands out as a hallmark sign of kidney dysfunction in animals.