As an emergency physician, I have looked into the data on dog bites on many occasions. Keeping in mind that almost all studies have inherent bias based on who performed the study and what their initial hypothesis was, I have been able to determine the following based on the numerous studies that are out there on the dangers of pit bulls/American bulldogs and their mixes vs other breeds:
1. It does not appear that pits/bulldogs and their mixes are responsible for any more bites than any other breed of dog. Dogs of all breeds are somewhat unpredictable and will bite for any number of reasons. As such, there are inherent risks in keeping them as pets.
2. Dogs are responsible for far more morbidity and mortality in humans than most other animals. A lot of this is the much higher level of exposure humans have to dogs due to their propensity for keeping them as household pets across the world, but the fact remains people should be more wary of a dog with which they are unfamiliar than they are with say a snake or shark. The animal which is by far and away the most dangerous to humans is OTHER HUMANS.
3. While pits/bulldogs and their mixes are not responsible for a higher rate of bites than any other breed, they are by far and away responsible for the most deaths related to any breed. These dogs don't play around when they attack. They are also responsible for more gruesome injuries and the injuries cost more in medical management and rehabilitation.
Having said these things, I still own a dog and love dogs. I can also say with absolute certainty I would never own a pit/American bulldog or mix with obvious phenotypic tendency towards those breeds.
I do feel the data shows it is inherently more risky (in regard to chance of serious injury or death) to own these breeds of dog. However owning any dog is risky and all dogs will bite. Even your family pet you have had for 15 years.
In fact, as many dogs get older they become much less tolerant of humans. I think you could say the same thing about humans as we get older and our tolerance of other humans.
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