Two adults were taken to hospital with serious injuriesTwo people have been injured in a dog attack thought by police to have involved "an American bully XL-type breed".
It happened on Purcell Road in Coventry on Thursday afternoon.
Officers Tasered the animal before placing it in a wheelie bin "to ensure the public's safety", West Midlands Police said.
A man and woman were taken to hospital with wounds described by the force as serious but not life-threatening.
A decision was taken by the owner of the dog to have it destroyed, police said.
The attack happened inside a flat but the dog then escaped into a communal area of the building.
Those injured were said by police to be known to the dog's owner.
"We understand this was a very distressing incident for anyone who witnessed it," the force said in a statement.
Police said extra officers were to be deployed in the area to offer reassurance to the public.
The West Midlands has seen a spate of dog attacks in recent weeks including a fatal incident in which an American bully XL was suspected of being involved.
The prime minister this month confirmed plans to ban the breed.