Keerthy Suresh starrer Penguin started streaming on Amazon Prime since June 19 and has been getting good reviews from moviebuffs for her acting, photography and the score. Keerthy Suresh plays an expectant woman who goes in search of her missing elder son. She is always followed by her pet dog Cyrus wherever she went. In fact, the dog also plays a key role in the story. Actually, Cyrus whose original name is Maddy is director Eashvar Karthic's pet dog. When the crew found that all the trained dogs for movies were busy, the director chose to cast his own pet. It may be noted that Maddy was not technically trained for films but the canine performed well.