The plug part of an animal tail butt plug can be used for temperature play if it's made of a material that can safely retain temperature, such as glass or metal. To experiment with temperature play, warm or cool the plug in a bowl of water, then test it on the inside of your wrist before inserting it. Avoid extreme temperatures that may cause injury or discomfort. Remember that the tail part of the toy should not be exposed to temperature changes, as it can damage the material.