When a wound is particularly messy or has been sutured improperly, a dog ear can form. A dog ear is a flap of skin that does not fit cleanly into the suturing of the rest of the wound. This video features a doctor explaining how to suture a dog ear properly. One handy tip: if you lengthen the laceration away from the dog ear, the skin will hang looser and be easier to suture. Counterintuitive, but effective.