Having lived with their owner under the same roof for 10 years, both Inu-kun and Neko-sama have grown some human-like qualities. While Hidekichi goes to the toilet in the middle of the night, Inu-kun takes over the whole bed just to see how she'd react. And Neko-sama, who's actually a scaredy-cat, deliberately naps beside a trash bag just to prove that he wasn't scared out of his wits by it earlier.
Animals can't talk, but there are so many ways they communicate and interact with each other.
It may have been 10 years already, but every day is different and it never gets old watching them eat, play, and sleep.