The "One Tree Hill" actress has shared a heartfelt message for her "best friend" on Instagram.
"Goodbye my Sophie dog. You were my best friend. You never left my side and I will forever cherish the 8 years we had together.
"I'll see you at rainbow bridge one day but in the meantime run like crazy and eat as much food as you want there. You are cancer free now baby girl. I love you," the actress wrote alongside a picture of her holding the pup one last time.