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Dogs have anal glands located and 10 and 2 (like a clock) beneath the tail. These glands normally secrete a smelly substance when your dog poops. Sometimes they fail to express themselves so you have to see the vet or a groomer to have it done for you. This will give him a great deal of relief.
If the glands are infected, you will need to see the vet to get antibiotics.
Let me know if you still have questions about this.