My cat used to eat her dry food out of a feeder on the floor in my bathroom. I found out that my dogs love "Kitten Chow" by having that big feeder emptied a couple of times. Now Mimi eats either in the laundry room on top of the dryer or on a far corner of the kitchen counter. They do all share a water bowl.
I wouldn't think that a little cat food would hurt the dogs, but it gets a little expensive when they are eating a three pound bag full in one session! I do know that cats get terribly sick (throwing up) if they eat canned dog food.
Hope this helps.
Logan