Here is a very detailed tutorial that results in a very real, very graphic laceration.
A crush wound may have irregular margins like a laceration; however, the wound will be deeper and trauma to muscle and bone may be apparent.
Large cuts may require sutures and should be done by a maxillofacial surgeon for a good cosmetic result, particularly when the laceration is on the edge of the lip line (vermilion).
A typical dog bite results in a laceration, tear, puncture, or crush injury.
These methods of treatment require to be modified for wounds in special situations and for those in which there is much contusion and laceration.