I bought a dog that has a bad ear infection so I have given him doxycycline and penicillin and have washed his ears with vinegar and put ear mite killer but it still persist so if anyone can help I sure would be open for advice.

Shoot some ivermec in each ear

Could be a yeast infection caused by staying wet inside the ear.Vagisil cream for women works really well,a little in each ear for a couple of days.

Put baby oil in thr ear worked for me

Get a script from your vet for cipro 500mg , spay scarlex in the ear. Good huntin

chip I used ivormec combined with baby oil to hold it in there and cleared right up..