Liz Buchanan BVSc MRCVS
Hello - thank you for this interesting question. There are other causes of itching in dogs that might look like this, but it sounds as though your vet knows your full history, has examined your dog and worked up the case- and that the signs go away with the tablets, so I'm going to assume an allergy to answer this question. The main thing to remember about allergies is that they are chronic illnesses, as opposed to acute ones. This doesn't mean good vs bad or bad vs good; rather, acute illnesses strike suddenly and then are over, for example a lung infection or an injury. Chronic diseases are the ones that once you have them, you have them (eg "type 1" diabetes). In reality, there is no neat dividing line between the two; allergies can start acutely. But once a dog has an allergy, she has one; treatment isn't to make it go away but rather, to control the symptoms.