Hello and welcome to Petco Pet Education Center, formerly Petcoach. Aural hematomas are very frustrating because they often re-fill. I find the best way is to get a tube (like a toilet paper roll or a similar shaped roll that is smaller in size, depending on the size of your dog), and wrapping that in a layer of soft padding. Then place the roll on the inside of the ear, and then you have to wrap the ear around this, and then you often have to wrap this to the head and get an E-collar to prevent scratching the bandage off. You have to use proper bandage material to allow proper air-flow, as well as making sure the wrapping isn't too tight (the blood flow can be cut off and the ear can die and fall off) or too loose (the bandage just falls off). I recommend having this bandage applied by your local clinic. It is a bit of a challange, and even the best ear bandages often fall off and need to be replaced. Best of luck with the ear!