Your pet should be cleaned before getting cremated to remove dirt, buckles and other memorable items your pet might be wearing. Most owners prefer to keep buckles as memorabilia. If items are left on the pet during the cremation process, the likelihood of them getting damaged is very high. You would want to brush your pet because the dirt will not burn and it will come out with the remains. As a result, the volume of the ashes will be greater and the size of the urn may change.