Answer:
Topic sentence: People should own pets only if they are ready and they can benefit from it.
Why people should own pets? People should own pets so that they can learn responsibilities, make their day happier, or easier if it is a person that needs a guide dog to perform daily activities.
Why shouldn't people own pets? People should not own pets if they are not willing or can not take proper care of them. Also, if the pet needs to interact with others, such as a dog, and the person does not have enough time for this, it is not a good idea to own one.
Conclusion: People should have pets only if they are responsible, have time to take care of them, and love their company, otherwise the pet and the owner would be unhappy.