My grangparents go out to walk the dog after supper everyday.
walk the dog 遛狗 因为是普通家庭晚餐,所以supper比dinner更合适。
如果不需要直译,也可以是Everyday after supper,my grandparents go out for a walk with their puppy.
puppy:小狗
My grandparents go for a walk with their dog after dinner every day.
My grandparents go to walk their dog after dinner every day.
My grangparents take a walk with dog after dinner every day .