Hi Sarah- I too have a dog who enjoys my kitties canned food. Usually I can catch him in time and if I make a loud noise he’ll stop. He isn’t interested in her dry food though. I agree with Crazy4cats that a small amount of cat food will not harm them, but eating cat food in larger amounts over time could.
My dog did at one point like the cats poop, however one thing that helped was changing the style of litter box to a storage tub with a hole cut in it. If that ever becomes an issue for you that could be something to try! Cats also really enjoy roomy litter boxes.
