There are lots of dogs-and lots of yorkies-that eat poop. There are several reasons they eat poop:
-They could be missing something in their diet
-The poop smells like their food to them, so they eat it again. This could be due to a low-quality food not being digested, or sometimes high quality foods have so much "good" stuff in them, that all of it doesn't get fully digested either. You may want to adjust food
-They are trying to hide the poop from you
My vet said this is not harmful to the dog-though it's REALLY gross to us. You can buy "Deter" Tablets at Petsmart, and give them to your dog-check the package for dosing. This has ingredients in it that make the poop "taste bad" (you'd think it already would
). Once you can break the cycle, they may stop for a period of time. Sometimes puppies will simply outgrow it too.