Liz Buchanan BVSc MRCVS
Keymaster
Hello! This is a common question. Often it's down to a mismatch between the outcome that the client is expecting from ear drops and the result.
Most ear disease is skin disease. All an ear is is skin that goes down a hole (where the tympanic membrane - the ear drum - sits and beyond it the hearing apparatus - but more often than not, it's the external, 'skin' part that's inflamed). Of course, it's enclosed and poorly ventilated down there and what's more, there are specialised cells in the canal that make extra "wax" when they get upset. Wax is great food for yeasts and sometimes bacteria, and when the delicate balance is thrown.... well, You are familiar with this.
Dogs often scratch their ears, particularly if they have an itch, for example caused by an allergy. Scratching damages the ear lining. The bacteria and yeasts (which actually live in all ears, quite happily, most of the time) move into the now-damaged ear skin. This causes infection and of course, makes the skin more itchy, which makes the dog scratch more.....
Many vets out there will swab the ear to confirm which, if any, anti-infection drops are needed; others use generic drops that kill a variety of organisms.
However, the vital point is that when a dog has eg a skin allergy or eg a narrow ear canal which predisposes to wax build ups, or a combination of these things, they always have them. The ear may clear up for a while but it will probably come back. We are all used to the idea that skin allergies are lifelong conditions - and it can be just the same with ears.
Allergies are now thought to be implicated in the vast majority of ear disease (dog scratches, damage - are lifelong, chronic diseases).
Some owners have to go back to the vets and reapply drops periodically throughout a dogs' life. It may be useful to ask the vet if this is the case with your dog.
It may also be worth asking if there is a skin specialist you can chat to, in case there's anything else that it may be worth doing to make things more comfortable. Always ask about the cost in advance.
Best of luck.
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