I know I'm a bit late on the convo, but I just thought I'd say that my dads dog has the exact problems yours does. She's a lab though. She's always had nasty ear infections and she gives no sign until she has a fever. And she gets skin infections all over. What we do is use an otc ear cleaning fluid that dries it out and swab out as much yuck as we can. For her skin, we give her baking soda baths. Nothing ever gets rid of her problems permanently, but with these methods we only have to do them a couple times a year at most. And it's way cheaper than what a vet would do.