i have had a cockerspaniel with the same problem. he went completely bald and the sides of his ears teared which was very painfull as well as itching. the is an allergy test wich the vet can do. with this they can see what he's allergic to. there is then a medicine that will be created for his allergys which he will need to be injected with. this is called hyposencibilisation. it's pretty expencive but works.first he will be injected a couple of times a month but this will become less and less as they become immuun to the allergy. eventually the allergy dissapears.
