Could be a yeast infection, common in dogs with ears that don't air out properly. Definitely check with your vet.
By
11/26/2009
Check out "aural hematoma in dogs" on Google. My dog had this, and ask your vet.
By
11/26/2009
Has he been scratching the ear ? (That might be why it is pink.) Does the interior of his ear smell? Either of these could indicate a problem. It's always good to check with your vet.