Neither author offered to explain how a full moon increases a dog's likelihood to bite a human, but many folk tales report vampires requiring blood when the moon is full. It is not likely that dogs are influenced by vampire stories, but crazy behavior during a full moon goes back at least to Roman times. The term lunatic comes from the latin word for moon. Another lunatic hypothesis bites the dust. Another study in the medical journal Family Practice shows that physicans get more calls after hours at night when the moon is full.
Nobody knows why.
Another lunatic hypothesis bites the dust. S Chapman, S Morrell. Retrospective observational analysis. C Bhattacharjee, P Bradley, M Smith, AJ Scally, BJ Wilson. RD Neal, M Colledge.