His ears are tender is that a yeast infection?
Its tender because he is probably scratching at it--- if you use Zymocs follow the instructions to the T.
Crop or un-cropping has absolutely NOTHING to do with ear issues, it is an INDIVIDUAL DOG issue, I have had issues on cropped and un-cropped dogs equally and have done LOTS of research and asked LOTS of folks its an old wife's tale.
Right at the moment I have 10 dogs ALL cropped and have issues with just one.
O