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I am sorry to hear you are worried about your dog. My name is Rebecca. I am a veterinarian and will do my best to help.
This could be an infection in one of her anal glands, if the blood is not in her feces. I would have her anal glands checked (putting on a glove and feeling inside the anus where the glands are located) and starting antibiotics if there is blood in one of the glands.
Let me know if this helps and what other questions I can answer.
How is your Corgi/heeler doing? I hope you were able to see what I wrote!
Please let me know if this was helpful and if you have any more questions.