Dogs are better walking partners than humans.
What a shock. Dogs don't make excuses (hot weather, headache, just don't feel like it...) And as some commenters note, they train us.
Fisher the hyper-Chessie expects breakfast soon after I get up. And then the morning walk must begin within 10 seconds, or he sits outside the front door, whining and crying.
The below-zero (F.) weather last week had no effect on him. We now say that he is "insulated by insanity."