Welcome to Yorkie Talk! Little Yorkies, especially puppies, often need special attention to their back ends to make sure they stay clean and unobstructed.
Sometimes full anal glands can be a problem. Some dogs express them naturally and some need help. Sometimes a diet change can help. If the glands become bothersome, the dog may scoot or hide in pain. Then the glands need to be manually expressed and possibly checked by a vet to rule out infection or impaction.
Other possibilities for difficulty pooping include constipation (a warm soak of the back end can help), bowel obstruction, irritable bowel, and a couple of rare conditions.
Has your pup seen a vet for a wellness check? I'm guessing vaccinations are also needed since he is only 8 weeks, so I would have the vet take a look at his back end.
__________________ Kristin, Max and Teddy  |