Security may be important, but meeting people is a significant result of dog ownership. While walking, dogs love to sniff each other and make acquaintance. While they do, the owners can strike up a conversation, too. Dog parks provide owners with a place to have conversation while the dogs play together. If you are lonely in the city, perhaps a dog can help you with meeting new friends.
Companionship, security and friendship are three main reasons for people to own a dog. Be sure, however, before you make the big step of owning one because dogs may live as long as 16 years.