I once worked in a place that held a 'Bring Your Dog To Work' day. The intriguing thing to me was that the dogs very much had the personalities of their owners, whether calm or anxious.
if you mean how obese they are, I have a friend who is very thin and super disciplined in his life, hates clutter, everything has its place, and his dog is super undisciplined and gigantic. Conversely, my dogs are borderline underweight and I am very strict about food intake and regular exercise, yet I could stand to lose a few pounds.