You should seek medical attention immediately following a dog bite. Even something seemingly minor, like a puncture wound, could open your body up to nasty infections. These infections could cause you more pain than the physical injury itself.
In addition to seeking medical care, you should keep the area around the wound clean. This may involve regularly changing bandages or applying antibiotic creams. This way, you prevent your condition from worsening, and you combat any allegations that you made the condition worse.