Does the dog enjoy possibly the smell? Maybe you could try a different brand, maybe he'll/she'll stop. It might be the scent... Good luck. (Maybe you could put the boxes in another spot if that doesn't work.)
I laugh when I read this one because I have 3 dogs and all 3 love the cat box. nothing we did helped . I keep the cat box in the guess bathroom So after a few years I gave up and cut a kittie hole in the bathroom door .The door is just big enough for my cats to get in but to small for the dogs.after we put the door in, we were very surprize that no one notice the door unless they saw a cat coming out of it Im not sure if you would want to cut a kittie door in your bathroom but we have never been sorry we did. Good luck Misty
I solved this problem - and made my job easier in the process - by clearing off a bureau top in the room with the litter box and setting the box on top of it. Just make sure the table top is larger than the box so that the cats have somewhere to land when they jump up. They will quickly learn to jump up carefully.