Which animal do you want to keep as a pet? Why

I like to keep dog as a pet because dogs are mankind's best friend.
Firstly, they are loyal and reliable. It is not difficult to find out such instances in our society to prove that. No matter how bad their mankind friends are or no matter how the their mankind friends cheat or even hit them, dogs are still stick around,without escaping, without complaining, without revenge, just staring their so-called friends with a pair of extremly innocent eyes. Can men do that?
Secondly,they are the best cadidates to protect security.A famous funny star in China, Huanghong, once said that when talking to the ability,one dog can overwhelm six safeguards.
Dogs bite people when they have to be, and they bite bad guys without any hesitation.
Thirdly,they can be good listeners and secret-keepers as well.Sometimes people want to say something to others, howerev,some private secrets could be leaked.Dogs will never let such thing happen, and they will never interrupt.
In a word, I love dogs in all living animals, so I want keep a dog as a pet most.