If the scenario was centred around my two girls I would take the food away.
Cassie eats her food straight away but dottie always seems to keep a little bit on the side

Cassie seems to know that more food is just around the corner dottie doesnt seem to know this. She was the first born of 7 puppies but was bullied by her litter mates and was made to eat last so every meal could be her last as far as she is concerned.
Cassie is the dominant dog and could easily take it away from dottie .
Cassie is a fair dominant dog and lets dottie have a growl now and then

she could take the food from dottie but never bothers too . dottie gives out a growl sometimes if cassie walks by when she has food even though cass isn't bothered or even after the food lol.so I take it away from dottie knowing that she has eaten enough and she is guarding a prize.