Use the following two articles to introduce your favorite animals in English for your reference:

I like dogs because they are good friends of human beings. They can do many things that are beneficial to us, such as guarding our house, welcoming guests, helping the police, and so on. Some trained dogs can even guide the blind and save lives. So they are regarded as our family members. I hope that one day dogs can live in harmony with human beings.

My favorite animal is swan. They are white. They swim very well. I think they look like a beautiful girl in a white dress. They have a pair of wings, and they can fly well. I believe they are angels from the sky. They bring us love and happiness. They are always friendly to us. We can't hurt them because they are our friends. I love them! I like dogs too. They are not beautiful, but they are best friends. They can drive away thieves. Dogs have the best hearing and vision. They can hear and see in the dark. If we are in danger, they will help us at once. They don't care about their lives. So, I love them.