When a veterinarian recommends euthanasia, it is almost always a complete shock. As a result, pet owners are left with a significant decision that they must approach with deep thought. Whatever the case, there is never a standard right or wrong decision. It should instead be based on individual factors.  Quality of Life Every dog or cat deserves a fruitful, enjoyable, and happy life. However, there are a variety of injuries or illnesses that can impede the delivery of this goal and, as such, guarantee that the animal's life will be anything but joyous.