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Hi there, you are through to Dr Linda, a UK based vet.
I'm sorry to hear Rolo has this issue.
It sounds as though Rolo had an anal gland impaction which resulted in an infection/abscess.
She likely needs further vet care which would include antibiotics, anti-inflammatories and a check of her glands.
To protect them for now, use a buster collar.
You can clean the area with cotton wool and saline.
Going forward, she may need a diet with more fibre, a change in her lifestyle (so she is more active) and regular anal gland emptying (this may mean she has them emptied every 6-8 weeks).
I do hope this helps and if there is anything else, just let me know.