Periodontal disease is an oral disease common in middle-aged dogs and cats, with halitosis being the most common sign. There are many commercial products containing chlorhexidine, cetylpyridinium chloride (CPC), zinc salts and essential oils for controlling halitosis and periodontal disease. CPC is a quaternary ammonium compound and has a broad spectrum antimicrobial activity. In this study, oral spray (OS) and gel (OG) containing CPC was applied to the dogs’ teeth twice daily for 3 weeks, and their effect in controlling periodontal disease and halitosis was examined. In the 3-week study, OS and OG were significantly effective in controlling plaque, calculus, and halitosis. Therefore, the OS and OG containing CPC were effective in controlling periodontal disease and halitosis in dogs.