The Benazepril will lower
blood pressure, so if your dog does not have high
blood pressure - the medication could cause blood pressure to fall dangerously low. With cautious low-dosing and very regular blood pressure monitoring, it can be advantageous. However, if there isn't at least weekly checks on blood pressure, then it's a dangerous form of treatment for a dog that has normal blood pressure.
All drugs, not just Benazepril, cause issues for the kidneys. Why?