I had the same problem with both of mine. Vet said it was scabies due to the fox population. Spent $115 for the treatment and they're still scratching and licking. Now vet says it's an allergy which is what I thought from the start and told me to use Zyrtec. So I'll give that a try and see if it works.
As a side note, my male itched so bad but couldn't get to it. As a result, he could only get as far as the end of his tail that he licked so much, he actually had exposed bone showing. I got it healing up nicely now. Make sure Shadow doesn't do the same.
You see, I'm not like a alpha,
I'm the ALPHA