It is forbidden to purchase from stores in cities of idol worshippers (presumably during their holiday) that are decorated. Reish Lakish and Rabib Yochanan debate what the decoration is and why specifically those stores are forbidden. According to Rabbi Yochanan, the issue is because those stores pay tributes to the idols. Items purchased in a forbidden manner are to be rendered useless. For animals this means to cut off the hooves. A question is asked why this is n’t forbidden on account of tzaar baalei hayim – mistreatment of animals? Why is another context is the penalty to close the animal in a room and let it die? What is the difference between the 2 cases?