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Greeting: Sorry your pup is in discomfort. Is he trying to lick at his anus or scooting around on his anus as though it is itchy?
Is the swelling just off to the side of the anus? or directly on the anus tissue.
Can you google anal gland abscess images and see if it looks like those images?
A picture would be very helpful to get a better idea of what is going on