Robin Roberts and her partner Amber Laign are the proud owners of rescue dog Lukas, who often features in the Good Morning America star's Instagram posts.READ: Robin Roberts shares bittersweet message as she asks fans for supportSo it came as no surprise that the 60-year-old chose to share a sweet video taken by Amber to mark the first day of the new month.The TV star took to Instagram to share footage of Lukas sitting in the front of a bike while riding along the road. VIDEO: GMA's Robin