The main difference is that an alert dog does not attack. Their only purpose is to bark to let you know if someone is nearby. This is the only thing he will do in the presence of a stranger Dog trainer spring Texas. On the other hand, a guard dog is trained to attack and defend his home or a person. They are very different jobs.
The German Shepherd was bred to be a guard dog. Originally, he was bred to protect sheep and other animals from thieves and predators. In fact, they attacked anyone who approached what needed to be defended.
On the other hand, many small dogs were bred to be alert dogs. Small dogs perform best in this role because they can stay hidden and are very loud. In some parts of the world, alert dogs were bred alongside guard dogs and worked as a team. The alert dog called the guard dog so that it could do its job against the intruder.