coordinate system and find the impedance point falls on the right side of the graph on the horizontal line, you know the circuit is equivalent to a pure resistance.
The most likely cause of the bleeding is from the skin of the outer ear canal after you have been drying your ears a little too vigorously. In the absence of infection, and with you feeling perfectly well and retaining normal hearing, I am sure that you are wise to accept the advice of your GP and carry on as you are.
What you should see is a clean, pink ear canal. If you notice discharge, redness, swelling, or odor, it's time to talk to the vet. Left untreated, ear problems in dogs can result in severe pain, hematomas (the ear flap fills up with blood), balance problems, and even deafness.