I'm sorry I can't agree that rescues will slow down after they get used to having regular meals.

I have a Lab/Chow mix that has always eaten all of her food, and fairly quickly. I have had her for 3 years and she is now on reduced fat food, measured out because she is 20 pounds overweight! I have to be sure she doesn't swipe leftover dog food from the other two.

Some dogs will always eat whatever they can find; others are fine on a free feed schedule.

If you are feeding twice a day, even if it isn't at very regular times, all of your dogs should do well. The ones that eat fast won't get too fat and the others will learn to eat when it's in front of them.

I think I'd put a ball or large rock in Millie's bowl (and maybe separate her from the rest) untill she learns to slow down.

Mary