Ear Mites That Keep Coming Back in a Puppy
Ear mites are common in puppies and spread easily between pets. They often come back because other animals in the home aren't treated, the treatment isn't continued long enough, or the problem was actually a yeast or bacterial infection rather than mites.
Ask your vet to confirm mites under the microscope. Several prescription spot-on and oral parasite products treat ear mites effectively; treat every dog and cat in the household at the same time, using a product suitable for each animal's species and age. Your vet can also clean the ears and treat any secondary infection.
See treating dog ear infections.
This is general information, not a diagnosis. Please follow your own vet's advice.