According to a report cited in the the Journal of Craniofacial Surgery, dog bites to the face are a relatively common injury in young children, and often require repeated plastic surgery procedures to deal with persistent scarring.  They may require primary and revisional surgery. All result in permanent facial scars.

A report cited in the Journal describes the treatment and outcomes of dog bites of the face, scalp, and neck based on a case series of 107 children over a 10-year period. The average children's age was 5.9 years. The majority of families (77%) opted for scar revision between 9 and 18 months after initial treatment to improve the aesthetic outcome. Lawsuit actions resulted in 39 of the cases making good documentation an essential part of treatment. Dog bite injuries to the face in children frequently require multiple scar revisions to obtain the best possible aesthetic outcome, and the family should be so counseled at the onset of treatment.

According to research cited, "[R]egardless of the severity of the trauma, most dog bite injuries result in permanent scars, and secondary revision surgery is frequently needed,"

Facial Dog Bites in Children May Require Repeated Plastic Surgery