The ear flap, or pinna, is a sheet of cartilage covered on both sides by a layer of skin and hair. The pinna is often involved in diseases as part of a generalized process, especially in the case of allergic and autoimmune skin diseases.
It is not uncommon for the pinna to be injured during fights with other animals.
Treatment: Control bleeding and treat the wound as described in Wounds. Apply a topical antibiotic ointment such as triple antibiotic or Neosporin. Leave the ear uncovered, unless your dog shakes her head and reopens the wound so that bleeding restarts; in that case, you may need to bandage the ear to the head. Wounds caused by animal bites are often complicated by infection and must be watched carefully.
Large lacerations, and those involving the edges of the ears or the ear cartilage, should receive prompt veterinary attention. Surgical repair is necessary to prevent scarring and deformity. Your veterinarian may decide to bandage the ear to the head to keep it still for faster healing.