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The best recommendation I can make at this point would be to clean out Malty's ears after each swim. You want to be sure to use an ear cleaner with a drying agent in it such as Epi-Otic, Malaket, Duoxo Micellular or similar product. Using this daily can help prevent ear infections by drying his ear canals and making it a less ideal environment for bacteria and yeast to grow in.
If he currently has an ear infection, it should also eye treated with an antibiotic and i recommend keeping him out of the water until the infection is gone as it will be nearly impossible to control if his ears continue to get wet. You may also want to use ear plugs to help prevent water from getting into his ears in the first place.
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