If you're looking for anime similar to Hokkori Hakoiri Neko Boys, you might like these titles.
The series follows the black cat Monroe and the human Yoppy and their "normal and special everyday lives."
This story follows the daily lives of a cat named Tama and his cat and dog friends. As their curiosity gets the best of them, they learn enduring values of friendship and teamwork.
Nyanya is a psychotic orange cat with only one thing in mind: escape! Determined to keep his owner Young-Sook from getting him neutered, he concocts one crazy scheme after another in hopes of liberating himself from her apartment and finding a cute female cat to be his girlfriend. Willing to do anything to save his nads, the big-headed cat terrorizes Young-Sook night and day. But no matter how much annoyance, abuse, and property damage she's forced to endure, Nyanya will always be her beloved pet - for better or worse!
The daily life of a household that has two cats: Azuki and Daizu. Azuki and Daizu belong to an office worker in her 30s who loves cats. The owner lives with her father, mother, grandfather, and older brother, the latter of whom the cats call "Megane" (Glasses). Megane adopted a Shiba Inu dog named Mamenosuke after Mamenosuke's owner died. Mamenosuke grew up around cats so he actually thinks of himself as a cat.