Amanda Seyfried (40) mourns for her beloved dog Finn. On Instagram, the actress says goodbye with an emotional photo, which shows her cuddling closely at her Australian Shepherd. To this end, she writes only a few, but meaningful words: "This is forever and ever." The article gathers numerous condolences and encouraging messages from friends and fans who express their sympathy to the two-time mother during this difficult time. Finn had accompani…