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If there is a sore on either side of the anus then it may be that an anal sac was full and blew open and it may be infected. What happens is the sacs are located on either side of the anus and they are usually expressed with a bowl movement. IF the stool is too soft the sacs do not break. Sometimes the dog scoots along the floor to break them open.
different disease of the anal sacs are abscess, tumor, impaction and inflammation.
In some dogs they just have a problem with the sacs and they are eventually removed surgically.
I am going to direct you to a couple of sites on the anal glands for reading but you should see your vet as antibiotics and a flush may be needed.
Anal sac abscess picture http://www.my-pet-medicine.com/wp-content/uploads/2006/10/180px-Anal_gland_abscess.JPG
Here is a video that will tell you how to care for them until you can see your vet. https://www.youtube.com/watch?v=1qP5dRdjyoo
Here is a video of an anal gland abscess https://www.youtube.com/watch?v=Xu61sqnkVLM
If you find that the dog's stool is soft normally , adding some pure canned pumpkin to the diet daily can help.