This can develop when a dog with reoccurring infections is given many different types of antibiotics, and most of the bacteria are killed but not all. What lingers is a strain that is very strong and resistant.
When the culture of the dog’s ear discharge is done, this will show if it is indeed Pseudomonas. This will also show if the particular strain can be eliminated by the very strong antibiotics of Enrofloxacin or Orbifloxacin. A topical treatment will be given as well to use at home.
Last Resort - If the cause of the reoccurring infections cannot be determined and medication is not working at all, the final step that may be taken is surgery. A specialist will surgically open the vertical canal. The ear is then completely cleaned out and treated. This is done to prevent any more scarring, since scarring can become so great that the canal becomes almost closed.