KALAMAZOO, Mich. -- Police say a boy who was left in critical condition after being attacked by a dog Saturday morning has been transferred to Ann Arbor.

The attack happened in the 1100 block of Lay Boulevard in Kalamazoo just after 3:30 a.m. Saturday morning.

The toddler was being watched by a friend of the family and was attacked by their dog, leaving the child with life-threatening injuries, police say.

Animal control has taken the dog in for quarantine.

Police said Sunday that the boy was taken to Ann Arbor Children's Hospital where he immediately went in for surgery.