The development version is not compatible with earlier Guarddog firewalls. You have been warned. It is now possible to specify user defined protocols. The first developer release aiming at version 2.0. The 1.9.0 and higher code is a rewrite and redesign.
Significant changes are the use of XML to store a database of information about network protocols.
The work and code is also shared with Watchdog. I intend to fully document the XML format I've designed in the hope that others will find it useful and support it. Guarddog now has the concept of 'zones' which allow you to place different hosts and networks into groups which can then have different firewall policies. Router configurations are a target for 2.0, but this development version still doesn't support them, yet. No real changes except for updates and additions to the documentation.