Victoria Hewitt, 42, watched helplessly as her 'monster' dog Karma savaged the children at her home in Norfolk before a neighbour intervened.
The incident happened in the Trebanog area of the Rhondda Valley, south Wales on April 7. (stock image)
Police say they have contacted all veterinary practices in the city in a bid to locate the animal.
One couple say the moment their American bulldog was seized was like having a "child ripped away".
DOG PICTURED IS NOT THE XL BULLY IN QUESTION: Emergency services were called to the first floor flat where the dog pounced on the young woman killing her within seconds.
Despite their ferocious reputation, a new study shows that XL Bullies don't actually bite harder than dogs of a similar size.
A court heard that the dog's owner, Justin Allison, didn't do anything to help the girl under attack.