um not really plausable if you ask me. brands are typically just a series of letters and numbers, or symbols. and on the neck, not inside the ear. its not really painful. its the same as if you went and got a wart removed by freezing it. same thing. just a little pinch. all our horses are freezebranded now. they used to have the inside of the upper lip tattooed. but this is a better method.
but the tanks that hold the dry ice to do this only have a small opening, so really youre not going to be able to put this big huge brand in it.