His ears itch, and it may be due to an infection. Get him to the vet. I am guessing this is a floppy-eared dog (hound-type). Floppy-eared dogs do not get enough air circulation into their ears and are prone to itchiness, infections, and discouraging odors.
You need to call in a vet because whats going on is not serious yet. But if you let it budge on it can become serious. Best of luck!
Infection or mites. Take your dog to the vet. He is suffering.
Ear infection it sounds like.
Go to the vet.
Tea tree oil drop should help.
That's what we used for my dog,
Put close to 1-2 drops in each ear twice a day.