* The American Kennel Club (AKC) ranks the Bull Terrier as the 76th most popular breed in the United States. This suggests a moderate level of popularity.
* The UK Kennel Club ranks the Bull Terrier as the 46th most popular breed in the United Kingdom. This indicates a higher level of popularity than in the United States.
* Various breed clubs and rescue organizations exist globally, suggesting a broader presence.
Considering these factors, it's safe to estimate that there are likely hundreds of thousands of Bull Terriers worldwide.
Keep in mind that this is a very rough estimate and the actual number could be significantly higher or lower.