Most often, this is because enough time was not spent outside to allow the puppy to feel relaxed enough and gain his or her bearings enough to relax bladder and bowel muscles, thus resulting in urination or elimination.
When waiting for a pup to go to the bathroom, 5 minutes can feel like 50! For this reason,we highly recommend leaving an all-weather chair smack in the middle of the designated spot. When you are house training your Shih Tzu puppy, you can bring a book or a magazine, sit down, allow your Tzu to roam within the diameter of the area (use a 6-foot leash) and allow 15 to 20 minutes for your puppy to do his or her business.
Never take for granted that the deed was done. Offer great praise pats and a small yummy treat every time that your puppy is successful (even if you had to carry him or her outside so that they could finish what was started in the house). This is motivating factor that will encourage your puppy to repeat the action, in that correct designated spot.
top element that interferes with training is not keeping a close eye on a puppy. A male can raise his leg and a female can squat within 1/2 of a second. Puddles can appear before you know it. Whenever you are home with your Shih Tzu pup, tether him or her to you with the use of a leash, and please be sure to have your Tzu wear a comfortable harness and not a collar, as injury so easily occurs with this breed when collars are used.
If there are times that this method will not work for you, placing the puppy in a gated off area or (for a short time) in a canine playpen will keep accidents confined to one location, but please be aware that this does not constitute housebreaking.