This thesis is an analysis of idioms containing cats and dogs in English and Japanese language. The thesis is divided into four sections. The initial section provides the reader a brief theoretical rundown of the fundamental phraseological terminology that must be understood in order to comprehend the study's purpose and importance. Here the framework of correspondence is explained, which consists of complete correspondence, partial A correspondence, partial B correspondence and lack of correspondence. The dictionary references, idioms analysed, and various cultural interpretations of cats and dogs are presented in the second section. First the Japanese idioms are presented, and then the English idioms are presented, always starting off by showing the cat idioms first and then the dog idioms. The third section consists of a case study analysis of some idioms and their counterparts in the other language. The research thesis’s final section provides a brief overview of the subject, summarizes the key findings, and emphasizes the value of learning idioms. The analysis of the idioms involving these animals reveals that Japanese idioms have 6 complete correspondences, 3 partial A correspondences, 6 partial B correspondences and 12 with no English counterparts, while the English idioms have 7 complete correspondences, 4 partial A correspondence, 2 partial B correspondences and 44 with no Japanese counterparts. Many idioms have no direct translations, highlighting cultural differences. The research confirms that while some idioms convey similar meanings, others differ significantly, reflecting each culture's unique context. Further exploration of idioms can enhance our understanding of language and culture.