Initial reports suggested the dog may be an XL bully, but confirming the breed will form part of the police assessment process, according to Avon and Somerset Police.
Two people - a man and a woman both aged in their 20s - have been arrested over the attack and remain in police custody.
The 19-year-old woman who died after she was attacked by a dog at a flat in Bristol on Wednesday has been named as Morgan Dorsett from Shropshire.
This breaking news story is being updated and more details will be published shortly.
It was sedated and seized by officers.
