Hi,
since we will probably never know what is going on inside, we can never know exactly - we are not even able to put ourselves into the position of another human being - I mean really know what another persons knows, really feel what another person feels... so how should we ever do so with a pet who cannot tell us what she wants in our language.
Of course it can be a feeling of remorse, why not!? And out of this it could have happened, that Angel just made a habit of eating out of Dallas's bowl. And maybe Duke just likes to share something with Angel.
Just some thoughts.
Nice greetings from Vienna
Michael