The more profound meaning of the sentence "I would rather be a rich man's dog than a poor man's man" may be that this person has no enterprising spirit and only wants to climb up to the wealthy family, no matter what they ask him to do. He is willing to be a horse or even a dog, and he only wants to get rich by any means necessary.

Actually, the "dog" here is the dog we often see in daily life meaning. Nowadays, many of our families will also keep a pet dog. Most of them take them out for a walk in their spare time and pass the time together. Otherwise, a dog sitting at home will seem very boring. Just because of their addition , making our family more and more fulfilling and making us more and more happy.