In Australia, at least, they don't:
> ## What is already known on this topic
>
> * Farming folklore holds that dogs bite more at the time of full moons
> * The research literature on the effect of lunar phase on human behaviour has mostly shown no association
>
>
> ## What this study adds
>
> * In Australia no association exists between lunar phase and dog bites requiring hospital admission
>
**Barking mad? Another lunatic hypothesis bites the dust**
BMJ 2000; 321 doi: < (Published 23 December 2000)