How to Treat dog ear cut?

If it is still bleeding, you can apply mild pressure (like you would on yourself) until the bleeding stops. Keep it clean with saline or clean tap water (room temperature, preferably) and watch it for the next 3-5 days. It should heal over just find on its own.

If the cut becomes very swollen, red, hot to the touch, painful, oozes any fluids or develops a bad odor, you need to take your dog to the vet for treatment - these are all signs of an infected cut.