Private cremations are usually done one pet at a time, but they can also be done with two to four pets. Communal cremations are multiple pets put into the furnace at once. The amount of pets to be cremated at once depends on the size of the furnace. Both furnaces for communal and private cremations range from 1800 to 2000 degrees. Before your pet is cremated, you should clean him/her. Removing buckles and other memorable items your pet might be wearing.