Corrections in red.  Stylistics in blue.

My Hairless Dog

My hairless dog is six years old this year.
He/She is very beautiful.
One day I found out that he/she had fleas/ticks.
Now I shave it off his/her fur/hair.
In my eyes, he/she is still cute.

When you are speaking about a dog you don't know, or a dog you dislike, you can easily call it "it".  But when you are speaking about your dog, whom you are fond of, you would usually say "he" or "she".