Happy Jack Ear Canker Powder is the perfect healing aid for ear cankers in horses and dogs. It contains Iodoform and zinc oxide which effectively will heal and dry up the inner ear canker, and outside areas that may be moist and sore due to the canker discharge. Complete recovery will happen around 2 - 5 days. It is also good for sores and rashes. This powder formulation comes in a squeeze container that is easy to apply.