So far I've seen two live action versions of this popular manga series in Japan, and this one is worth your time.

The story
A career woman in her thirties takes in a ballet dancer eight years her junior as a pet. At work she's in a relationship with a conventionally perfect boyfriend. The man proposes to her, but she's reluctant to accept him. Somehow she got addicted to the dopamines of petting her ballet dancer, especially his tousled hair that she washes every single day.

The actors/cast
I liked this version, the ML/FL are fitting for the story and the acting was quite natural considering the fact that this is a manga story.

The good and the bad
It seems weird, a story about a woman who shares her apartment with a man under the pretense that he's her old dog " Momo". She can cuddle him whenever she likes, no strings attached, like he's a living Tamagotchi. At work she's a cold fish, in such a way that her colleague/boy friend gets seduced by another woman who seems more open to him. So, is this just a love story, or perhaps a reference to human intimacy that is lost and found again? If so, I liked that statement, just like the message that you don't have to follow a conventional life style.

Overall
Anyway, I enjoyed You're My Pet like a fairytale. The actors have good chemistry, I liked their dialogues, and their kisses. This adaption has a sound, fulfilling ending, so if you like sweet romance, this is for you.