Feeding two dogs, same place, an issue??

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I have two dogs who are different in size and the quantity of food they eat. However, currently, we place their bowls side by side and believe they are eating from the right bowl for them individually. One dog is over 45 lbs. and the other is around 25 lbs. One eats from a plastic bowl and the other from a ceramic bowl. The quantity of food required for each is different. When the youngest dog was not owned by us, he was fed from the ceramic bowl he eats from today. So far, I believe they are doing fine the way it is, but...... is it? It is difficult to separate the two dogs, they are such buddies. I guess if it becomes a problem with one of them getting fat and the other skinny, I should be concerned. But the problem exists that if I have to separate them to feed them, should I start now, or just let it go until it is an issue?