Hello Nicole. This is Dr. Holloway, but you may call me Dr. H for short. I am sorry for the ear problems Bozley seems to be dealing with. He is a high risk breed for stenotic ears which can lead to chronic ear infections poor guy.
The medication that your vet is referring to sounds like a common medication that I am familiar with. This can come in a variety of different combinations but mainly it is an anti-fungal, antibiotic and anti-inflammatory combination that come in kind of a yellow goo consistency that has to be mixed in a specific manner and then placed in your pets ears and allowed to harden. This will typically cause a little temporary hearing loss, which is not permanent so it is nothing to worry about, and it will stay in the ears for a period of 2 consecutive weeks.
This medication works wonders for pets and owners alike who struggle with applying the traditional ear medications and cleansing regimens. I have a lot of owners who are more than willing to pay the little bit of extra cost to achieve good results with little to no effort on their end.
Now with this said, depending on the formulation that your veterinarian has it may behoove you to inquire about why the other medications failed in resolving Bozley's symptoms and to be perfectly clear why the vet thinks that his other ear medication preparation will likely be successful. Although this product works great on a number of pets, there are a few that have resistant strains of bacteria that could resist this medication even though it being effectively administered daily. If you and your vet feel that you have been unsuccessful in completely resolving your pets ear infection due to the fact that Bozley is just not cooperative and maybe you missed a couple of treatments that would increase the likelihood of failure, then trying the new medication without further testing is the way to go.
However if you feel that you have been applying all other medications as instructed and your pet is pretty cooperative, then having a bacterial culture done on the ear is preferred. Bacterial anaerobic/aerobic culture will specifically target the exact bacteria that is present and the medication that will rid it successfully. This information can then be used to formulate a more tailored ear medicine for Bozley specifically so that there is less chance of failure.
Also I will add that some pets have innner ear infections on top of outer ear infections, so please discuss this with your veterinarian as well to ensure this is not a suspsicion. Inner ear infections would also need additional oral antibiotics as well as topical.
I hope this information was helpful to you!. -Dr. H