If you are using the DNSWatch service, you can implement content filtering. This is especially useful if you have deployed the DNSWatchGO clients to remote endpoints. This will allow you to extend content filtering to devices that are not behind your firewall.
Configure DNSWatch Content Filtering
Log into your account at https://watchguard.com and navigate to My WatchGuard > Manage DNSWatch
Select Configure > Content Filtering Policies
There is a default policy built initially. You can use this policy, or create new policies.
If you decide to use the default policy, click Edit Policy
Click the Categories tab. You can either select whole categories, or expand them for specific sub-categories. Make sure to select Save Categories once you are done.
You can also click on the Safe Search tab to enable this function. This filters out explicit content from search engines.