Having swabs taken to identify the exact bacteria involved and the most appropriate abx to use would be useful. If the pus goes very deep down then the ear canal may need to be cleaned out under GA. Swabs could be done at the same time along with a skull Xray to see if there is also infection in the middle ear.
Ear infections can be a nightmare to treat successfully, sometimes the condition becomes chronic and it is a case of managing it rather than curing it. Management may involve longterm abx, non steroidal anti-inflammatories, possibly topical treatments with abx ear drops. There are also surgical options but each case would need to be assessed individually. Sometimes surgery may not be possible for a variety of reasons. Some surgical procedures are very invasive and they do not guarantee a 'cure'.
Good luck at the Vets xx
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