If you're in the market for a family guard dog that looks like a fierce predator but acts like a gentle giant, look no further than the Great Dane. This friendly, easy-going breed is somewhat lackadaisical and loves to lounge around the house. He really isn't much of a guard dog in terms of personality. But the mere sight of him would send any criminal running for the hills, despite that fact that a Great Dane is unlikely to attack an intruder. On the other hand, it will probably show off its sufficiently scary bark.
The best example of the Great Dane's demeanor is displayed in the cartoon "Scooby Doo." A Great Dane through and through, Scooby and his loyal pal Shaggy are more inclined to alternate between snacking and snoozing than to harm anyone. This is a great choice for a family looking for a pet that looks the part of a guard dog, but with low risk of actual aggression.