I am at a loss .I have a Jack Russell who just won't stop scratching. She will scratch her stomach on a concrete floor and he body on anything she can, so much so that she is now getting sores and bald patches. We have previously taken to her to vets where she had a skin scrape which came back clear and she keeps having cortisone injections which only last a little while. Can anyone offer any advice that can help her stop scratching . Thanks.