animal tf story mentally confused

a young girl named aria has had a weird mental disease where she often acts like a dog but is clearly human and it has been getting worse doctors can’t figure it out she has rarely even see dogs so how she started acting like one has been a mystery to her parents. One night aria couldn’t sleep for once looked at the moon and something changed in her and let out a big bark like a dog which wasn’t the first time but it felt so natural to her and looked down her body was a small choclate labrador puppy female her grandma who was staying explained the truth she was always a dog but was forced into a human body due to concerns about her small body and is growing at a human rate so will eventually be a full grown dog but until she grows can change to a human during the day but maintain her dog mind her parents understood as well.