Nothing wrong with that, after all most people aren't networking experts so programs like Guard Dog are a real winner in my book. However more experienced users might prefer something a little more powerful and customizable when it comes to Internet security.
Most people are familiar with or at least have heard the term firewall before.
A firewall is sort of like a wall between your network and the outside Internet. The problem with a firewall is that they're usually expensive and designed with a large network in mind, making them impractical for an individual user to deal with. The idea behind a personal firewall is to bring the high level of security and control you'd get with a full strength firewall but shrink it down to work on a single computer. What differentiates PC Firewall from competing products like Guard Dog, eSafe Protect, and others that also have firewall features is the level of protection offered. Basically, any byte going in or out is checked allowing nothing to escape.