Real Dog: Kimbo, whose registered name was "UKC's Most Wanted Kimbo," was a real American XL Bully bred by Gustavo Castro in Los Angeles.
Aggressive Inbreeding: He was the product of a brother-sister pairing and his grandparents shared the same father. This extreme inbreeding (a coefficient of inbreeding over 31%) was allegedly deliberate to achieve a specific large, muscular physique, but it also increased the risk of genetic and behavioral problems, including sudden aggression.
Links from his decended dogs....
Link to Attacks: Dogs descended from Kimbo have been linked to over ten documented attacks worldwide, some of which were fatal.
One of his direct descendants, named Niko, killed four-year-old Mia Derouen in Louisiana in 2014.
Another descendant was involved in the death of 65-year-old Keven Jones in Wales.
An 82-year-old woman in Oklahoma was also killed by a dog believed to be from his line.
Widespread Influence: Due to his popularity as a stud, a significant proportion of American XL Bullies, particularly in the UK, can trace their lineage back to Kimbo. A 2023 analysis by the campaign group BullyWatch found that 32 out of a sample of 50 UK stud dogs advertised online were related to him.
Notorious Reputation: Within certain breeding circles, Kimbo is known as "Killer Kimbo" due to the documented "rage" issues in his offspring that breeders have described as "not normal".