Vet
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I'd advise Advantage spot on (available OTC) if unable to get a prescription spot on.
On the same day, we must treat the environment and any other pets.
We should hot wash all bedding and blankets over 60°c, hoover daily and use a flea spray such as Indorex or RIP Fleas.
If itching persists, she may need some prescription anti itch medicine and antibiotics from her vet.
I do hope this has helped and please let me know if you have any further questions,
Take care,
Linda.