Should We Have Pets?

One topic that was brought up in class was the ethics of pets.  In class we merely mentioned the subject and did not pursue a discussion on it.  I was fairly interested in it and wanted to hear what other people had to say about it.  Personally I am for having pets, I have four dogs and I cannot imagine life without them.  Many pets also seem content with their current living arrangements.  But I do think some animals should not be pets, big cats for example.  Animals like that should not be kept by people, they're too dangerous and need vast amounts of land to roam for them to live a pleasant life. I do think people should have pets but I do not think all animals should be pets.