It is grammatically correct and makes sense. It could describe a bizarre fantasy scenario in which cats have become mankind's masters, or the people referred to by "us" might be unhealthily obsessive about cats to the point where the animals have come to dominate their lives.
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.
CliveThe cat owner goes to work everyday, while the cat naps and eats.Yes, I guess it could also be meant light-heartedly.
Which one is the slave?