A Calgary police service dog has been stabbed while apprehending suspects in an early morning break-in.

It happened just before 2 a.m. Sunday, at Grant MacEwan School on Falshire Drive northeast.

When officers arrived, two men fled the building and tried to escape.

The Canine Unit was deployed, and during a foot chase, one of the suspects pulled a knife and stabbed a police dog.

The animal was taken to the vet in life threatening condition, but has since been upgraded to serious after surgery.

Both suspects are in custody and charges are pending.