A Cumbria Police spokesman said:
"At approximately 2.40pm today emergency services were alerted to an incident at premises on Gilbert Road in Cummersdale whereby a two-year-old child had been attacked by the family dog.
"The child was conveyed to the Cumberland Infirmary in Carlisle and underwent surgery for serious facial injuries.
"The dog was removed from the premises and is currently kennelled pending an investigation into the incident by police and social services."
More top news
Consultant-led maternity services in west Cumbria will stay in place for another year - but their future is dependent on hospital bosses.
The number of homeless domestic and sexual abuse victims in Copeland has risen by more than 25% over the past 18 months.
The harrier, named Manu, is one of two chicks monitored and protected by the Northumberland Hen Harrier Protection Partnership.