My puppy will grab the cat's food every time, but the puppy's stomach is too fragile and allergic to the cat's food and it will cause diarrhea. So every time I feed them, I will control the order of their meals, which will be a little bit trouble. So I wanted to make something that would allow them to eat at the same time, and the dog wouldn't be able to eat the cat's food.

Source from https://www.instructables.com/Cats-Stool/