The dynamics of cat-owner relationships are often marred by misconceptions, particularly regarding feline aggression. This study explores the complexities of aggression in cats, investigating its various forms and origins to provide a nuanced understanding for owners. This study compares behaviors in single-cat and multi-cat households, analyzing how social structures and human interaction influence feline aggression. Behavioral data were collected through structured observation forms completed by cat owners. Results indicate that multi-cat households exhibit higher frequencies of aggressive and stress-related behaviors, such as ear flattening, hissing, and scratching, compared to single-cat households. Conversely, single-cat households show higher frequencies of biting and retreating, likely due to the solitary cats' reliance on humans for social interaction and stimulation. The study suggests that the presence of multiple cats increases social stress, resulting in more frequent aggressive behaviors. In contrast, single cats may direct their aggression toward their owners or exhibit stress through withdrawal. Promoting multi-pet households could mitigate some aggressive behaviors by fulfilling the social needs of cats, potentially reducing aggression towards humans and enhancing feline well-being. This research aims to educate cat owners about feline aggression's intricacies, advocating for better understanding and improved cat-owner interactions, ultimately contributing to higher adoption rates and better care for domestic cats.