I herd there was a pill to deture dogs from eating cat poo?

My puppy much like my old dog likes to cusine in the cat box. It's not an option to raise them because I have 2 boxes and they're in a small area in the bathroom and no matter how many times I tell my bf to keep the door only big enough for the cats to get through he never listens (I don't know which is the bigger problem the bf or the puppy lol) Anyways I have been reading that there is a pill that you can buy at pet stores to deter dogs from eating poop but I can't locate the name and the pet stores around me don't sell anything like that so does anyone know the name so I could possibly purchase it online? I know the reason why they eat it and I'm quite sure I lost my first dog to it ( She was 9 years old I'm quite sure she had a couple more years left in her) So if anyone knows the name that'd be great (The space isn't big enough for a babygate either and he's too small now for the covered cat boxes when he's bigger I'll switch to those ones)