There are various synonyms for the phrase "dog's-life," which essentially means a life of hardship or difficulty. Some of the synonyms for it include a hard life, a tough existence, a rough existence, a difficult path, and a trying journey. Other synonyms can also include a challenging lifestyle, an arduous routine, a daunting venture, or a strenuous daily grind. Although it is unclear where this term originated from, it is commonly used to describe a life of struggle, lack of privilege, or oppression. Therefore, these synonyms are often used to describe a life without ease or comfort.