New puppy eating older dog's poop?

Man I know a very good thing!!!!! OK well, put pineapple in your older dogs food and just try it. The poop tastes horrible when there is pineapple in it. Then your dog will see that eating the poop is nasty. But, when you add the pineapple to your older dogs food it tastes good to your older dog so don't worry. Hope I've helped and try it!! Good Luck!!