The problems we may encounter are the sanitation problem and the safety problem. We need to clean them and also protect ourselves from getting hurt.
More and more people prefer to keep pets because they can make people relaxed. People often work hard to climb a higher social ladder. During their process of working, they always work for 12 or even 14 hours each day, so they play with their pets, wandering around the park or cleaning them, which is a good way to get them out from the stressful life.