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Your beagle's floppy ears are prone to reinfection, so you will need to be diligent about preventing future ear infections. One way to do this is to clean his ears at least once a week. If he has had chronic ear infections, you may need to clean his ears every day. Your vet can recommend the ideal ear cleaning frequency for your beagle. Schedule your beagle's ear cleanings for the same day and same time each week. Be aware that regular cleanings may not completely prevent future ear infections, but will reduce their frequency. Do not use medicated ear drops after you clean his ears, even if you have some left over from his treatment. Overuse of antibiotic ear drops can lead to the growth of bacteria that is resistant to most forms of antibiotics. This can make future infections very difficult to treat. Your beagle's long and floppy ears prevent good air circulation within the ears. Without much air flow, heat and moisture can get trapped in the ears, which can lead to an infection. To increase air flow, flip his ears on top of his head so his outer ears are exposed to air. If he flips them back, use some cotton gauze and tape to secure his ears to the top of his head. When you have his hears flipped back onto the top of his head, wrap the gauze once or twice around his head. Wrap the gauze firmly, but not so tightly that your beagle is uncomfortable. The gauze is not adhesive, so you will need the tape to keep the gauze together. You do not have to leave your beagle's ears flipped up all dayhe probably wouldn't tolerate having his ears like this for very long. Talk with your veterinarian about how long to keep his ears up in this fashion. If your beagle has a food allergy, then switching his food would be key to preventing future ear infections. Based on the results of the food elimination trial, your vet would be able to identify the 'culprit' ingredient. For dogs, common food culprits include beef, chicken, and dairy products. Feeding him a diet that does not contain the allergy-causing ingredient can help prevent future ear infections. Be aware that a diet with a novel protein source (a protein your beagle hasn't eaten before) may help prevent ear infections for a while, but may not be as effective once your beagle's digestive system becomes used to the protein. A meat-based diet that is low in yeast may help prevent yeast-based ear infections. Talk with your veterinarian before making any changes to your beagle's diet.

Summary:
Clean your beagle's ears regularly. Let air flow through your beagle's ears. Change your beagle's diet.