My dog has been scratching around her hind quarters and the top of tail for weeks now. She’s had multiple baths with a flea repellent shampoo, been to the vets to have her glands squeezed and check for anything else and been taking a fish oil supplement. Something is clearly bothering her but I’m at a loss as to what. I was thinking of trying a flea collar in case it is fleas, but I want to know if they actually work. If they have a high success rate and she continues to scratch, then I’ll be able to cross that off.