
I am having just the same problem with our Bichon male who is only 6 months old. We have been to the vet 3 times with his skin/ear problems. There has been a little improvement since he was treated with anti-biotics and Pred steroid/anti-inflammatory but he still scratches several times a day and I feel so sorry for him. He seems happy enough but I wish I could stop him. It just seems that there are so many things it could be (grass, food etc) that its hard to know where to start. I changed his food two weeks ago to Royal Canin junior dried food but have been advised since that there are a lot of things in it that he could be allergic to so I am going to get the James Wellbeloved puppy food and leave him on that whether he likes it or not. I have put tea-tree oil on him but it made him all sticky and he hated the smell, it was quite strong. He has evening primrose oil capsules every day. He has lost hair off his legs, flank,tummy and bottom and he looks a bit of a sight because he looks like a dalmation underneath. I have read that someone tried athletes foot powder and that worked but I haven't tried that yet.
It is so frustrating and upsetting isn't it and someone who used to work for a vet said that they never seem to find out what the dog is allergic to even after doing all the tests (which are quite expensive I have heard) I wouldn't mind him having the tests if they could find out for sure what they are allergic to but if they still don't know then what is the point of the tests, other than spending hundreds of pounds.
Let me know if you find anything that works please.