Here are some possible reasons for his symptoms:
* Anal gland issues: Shih Tzus are prone to anal gland problems. If these glands get impacted or infected, it can cause pain and discomfort, making the dog scoot or cry.
* Parasites: Internal parasites like roundworms can cause digestive upset and pain.
* Injury: A tail injury or a condition like a slipped disc can cause pain in the tail area.
* Other medical conditions: There are many other possibilities, such as urinary tract infections, constipation, or even tumors.
It's crucial to see a vet for an accurate diagnosis and treatment plan. Your vet can examine your dog, run tests, and determine the cause of the problem.
In the meantime, here are a few things you can do:
* Observe your dog's behavior: Note any other changes in his behavior, such as changes in appetite, energy levels, or bowel movements.
* Keep your dog comfortable: Offer him a quiet and comfortable place to rest.
* Avoid giving any medications: Never give your dog medication without consulting a veterinarian.
Remember, it's always best to err on the side of caution when it comes to your pet's health. Get him to a veterinarian as soon as possible for a proper diagnosis and treatment.