If the kidneys are functioning more efficiently, your dog may exhibit reduced thirst and increased urine output. This can be an indication that the kidneys are better able to regulate water balance and concentrate urine. In some cases, as kidney function improves, dogs may regain their appetite and experience weight gain. This can be a positive sign that the body is better able to process and utilize nutrients. Blood tests, such as serum creatinine and blood urea nitrogen (BUN) levels, are used to evaluate kidney function. If these values stabilize or show improvement over time, it can suggest that the kidneys are functioning better. Urinalysis can provide insights into kidney function. If the urine-specific gravity, protein levels, or other urine parameters become more normal or stabilize, it may indicate improved kidney function.