I think this is a case where it won't heal on its own - these infections extend deep into the canal and they're very stubborn to deal with. Cleaning can help reduce some of the discomfort, but it won't get rid of the infection, unfortunately. And this is one of those cases where the longer you wait, the more expensive it will be to treat. BUT, there are some things you can consider if money is an issue.
Firstly, I would recommend discussing what you CAN afford. Sometimes, in the case of an animal with an infection or an injury, some care is better than no care at all, and certainly better than euthanasia in many cases. So if you had $50 to spend at the time, a good vet should work with you to make that money go as far as possible. In your case, this probably will consist of prescribing antibiotics - it's usually pretty straightfoward. It's no guarantee and it's not the same as going the full gamut, but it's always better than nothing. Particularly where hearing is at stake. And we already have evidence that the infection has spread to the eyes, so we know it's established.
I would also call around to other clinics, as the cost from clinic to clinic for certain procedures can vary dramatically. I recommend asking their price for an office visit - this is a good representation of their pricing. For example, I had a dog with a cyst that had to be excised. One clinic quoted $800+ for the relatively simple and quick procedure. Another quoted $200 and they did a wonderful job. So that just goes to show how much it can vary.
In theory, you should be able to get this tended to for under $60. There's the cost of an office visit - I recommend calling around to vets and ask them their rate for an office visit, as this is often an indicator of their pricing - and reasonable is about $35. That's what I pay per office visit (the cost just to see the dog and for a basic exam) and I'm in the northeast, so things tend to be a bit more expensive here than in other areas of the country. Fortunately with an ear infection, there's a good chance they can diagnose the problem just by looking at her - there's little in terms of diagnostic testing required for this in many cases. So the only other cost would be for medication. You'll probably want ear drops and an oral antibiotic.
And again, be up front about what you can afford and most vets will work with you - they understand that we don't always have lots of cash hanging around and most would rather see a pet get treatment than turn you away, particularly for something so straightforward and curable as an ear infection.
Another option would be to contact an area humane society - like an ASPCA - to ask if they know of any low-cost veterinary clinics. Often, larger humane organizations run these clinics, or they can refer you to one in your area. Usually, they work with pet owners so that you pay what you can afford. The disadvantage is that there's usually little flexibility in terms of appointments, as these clinics are often open a few days of the week, so they're not idea for emergencies.
Another option to consider would be approaching a veterinary teaching hospital at a university in your area. Teaching clinics often charge significantly less for equal services and you'll have some of the best minds in the field working on your pet.
Here's a list of some additional resources that can sometimes help in a time of need:
American Animal Hospital Association http://www.aahahelpingpets.org/
Angels 4 Animals www.Angels4Animals.org
Care Credit www.carecredit.com
God's Creatures Ministry http://www.all-creatures.org/gcm/help-cf.html
The Pet Fund http://thepetfund.com/
United Animal Nations http://www.uan.org/lifeline/index.html
This list is for local and national help resources: http://www.uan.org/index.cfm?navid=163
I hope this gives you a bit of direction with your pet's treatment! And do let me know if you have any additional questions, okay?
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