Ответы и объяснения

I think that cats are the best animals. I've always wanted to have a cat. Last year my parents bought me a cat. I gave him a name Tom. He is now a big black cat.  Tom has a little cat house, where he sleeps at night and during the day. We play with Tom, but he never scratches me. In summer we take Tom to the countryside. Tom likes it very much. He is allowed to walk outside. Once Tom brought us a mouse. We didn't let him kill it, we saved it. I love my Tom very much.

Вообще, по правилам англ.языка местоимение, используемое при разговоре о  животных - it. Но в данном случае мы используем he, т.к. Tom для нас - это не просто животное, "оно", а член семьи - "он"