Police are investigating after an officer shot a dog during a traffic stop on Monday night.

The incident began around 8 p.m. MT in the 1400 block of 52 Street N.E. when police stopped a motorist for speeding.

The officer thought she smelled marijuana coming from vehicle, which also contained three dogs, so she called for backup and another officer arrived on the scene.

"Prior to searching the vehicle, the female member asked the male suspect about the dogs. The indication from the suspect was that the dogs would be fine and would not bother [the] officer[s] while they conducted the search. This interaction was captured on an in-car camera in the police vehicle," police said in a release.

But one of the dogs in the vehicle jumped out an open window, lunging at the second officer and biting his abdomen, police said. The officer shot the dog in the head.

The dog ran away and was later tracked down and taken to a veterinary clinic. Its condition isn’t known.

The officer who was bit was wearing a protective vest and was not hurt, police said.

The major crimes unit is investigating, which is standard procedure when an officer fires his weapon.

The initial traffic stop is also still being investigated, police said.