Before we got Chuck, Tadashi was always bad about eating and just isn't very good motivated as a dog. Chuck, by contrast, is a garbage disposal who will eat anything.
We've always made them eat at the same time out of necessity because if they did it separately, Tadashi would never eat or he'd leave his food out for hours at a time and Chuck would steal it when our backs were turned.
For a while, Chuck influenced Tadashi to eat more and faster. But a couple of weeks ago, Tadashi went back to not eating and now actually usually guards his food by sitting and staring at it. Chuck, in turn, can't seem to remember how to eat (when it's time to eat) even if we throw his food right at his face.
He will, of course, still climb on furniture to get at food that isn't his the second we're not looking.
Now... They're both the worst.