What problems do pets create for people?

First, Pets can make unexpected noises causing some complaints from neighbors. Worse, we sometimes don\'t know what they bark for and what to do about it. Second, we have additional chores by having pets. We have to walk them on a regular basis. We have to vaccinate them against various diseases, costing owners a lot. Lastly, it happened rarely with young pets that some pets got aggressive enough to bite their owners or children. However, with all problems above, if you have the heart to take care of them as one of your family members, you are eligible to be friends with them.