So, I can't speak for all dogs or even really particularly well for any dogs, however I do have some observations that seem contrary.
Many dogs react differently to their humans depending on their humans mood. Some dogs appear to posses great empathy, being bouncy and excited when their human returns it a good mood, but calmer and more cuddly when their human arrives home upset. If we assume that dogs, like humans, tend to believe that others enjoy the same things they enjoy, then your dog probably does not believe you went on a long walk when you come home stressed, tired, or upset.
Now, I realize there is a difference between recognizing one's mood is different and responding differently and understanding one's mood. And I really cannot speak at all on what dogs understand. It simply seems unlikely given what I do understand that dogs believe their humans are off having fun at their stressful and tiring jobs.
Many dogs react differently to their humans depending on their humans mood. Some dogs appear to posses great empathy, being bouncy and excited when their human returns it a good mood, but calmer and more cuddly when their human arrives home upset. If we assume that dogs, like humans, tend to believe that others enjoy the same things they enjoy, then your dog probably does not believe you went on a long walk when you come home stressed, tired, or upset.
Now, I realize there is a difference between recognizing one's mood is different and responding differently and understanding one's mood. And I really cannot speak at all on what dogs understand. It simply seems unlikely given what I do understand that dogs believe their humans are off having fun at their stressful and tiring jobs.