I think people keep pets first of all because of thier love to animals.Also some people have pets cause they feel lonley,and its great when you have a friend that is alway happy to see you.Pets also have families with kids because children get along well with animals.
In big cities are usually popular small animals.Because a lot of people live in small apartments were there's no place for big pets.Also people in big cities are usually very busy so they get pets that need less atention,fishes for example.
Yes,havind a pet is defenetly a huge responsobility.The pet becames another member of your family ,so it needs a lot of atention.Also you will have to clean up after your pet,and they can get sick just like people,so you will have to give them twice more care.
