there's nothing that you can put in there to prevent it... With many dogs, it simply becomes a "maintenance" issue where you have to treat their ears "x" times a day with your choice of application.muddyriver said:I did take her to the vet and had it treated. I want to get back into the water, but know it will happen again. I'm just looking for a preventative. Thanks for all you help. I enjoy the info!!!