Over time, this aggressive reaction becomes an ingrained part of the dog's behavior. But unless your fenced yard completely surrounds your house, the dog is only protecting your lawn. If a burglar sees that your dog is in your yard, he knows the dog is not in your house. On the other hand, if he sees a dog in your house, he won't attempt to break in. Additionally, outdoor dogs tend to bark so much that no one pays attention to them after awhile, even if the reason is legitimate.
Many people feel that leaving their dog in the yard allows the dog to get exercise.
This is not as true as it seems. This is caused by a fence that, as stated before, allows the dog to perceive stimuli without the opportunity to interact with it. This activity does not have the healthful benefits of exercise. Exercise comes from taking the dog for walks and playing with the dog. Health and behavior Outdoor dogs, almost without exception, are less healthy, and therefore more expensive, than indoor dogs.