Hello Ksenia.
Great job with this! I've included a corrected version below:
I always wanted a cat. When I was a child I got a cat. The cat was called Kuzya. He was black with a white neck and paws. He lived with us for 3 or 5 years. I don't know what happened, but he was taken to my grandma. He didn't want to live there, and one day he left. I cried and cried, but he didn't come back.
My second cat is Keks, or "pie" if translated into English. He is black and white, beautiful! I love him. He is four years old. He was born on Christmas. We took him home from an animal shelter. Everybody loves him so much!
Let me know if you have any questions!