Dogs, ear infections...

My dang dog gets ear infections all the time.
I keep him out of the long grass, keep his head out of the water, clean his ears with special ear wash.

Dam. Anyone else have a dog like this?
What do you do?

Right now hes miserable so I'm letting him lay on the electric blanket for the night.

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I cant stand to see him like this but I just have no idea what causes it or how to prevent it. I got so much ear medication for him its rediclious. This guy gets more doctor visits than I had in the last 10 years...