I'm not the other guy, and I don't have data, but the risk might be far higher outside the US.
These days, Americans mostly treat their dog like a family member. If you travel to developing nations, you're far more likely to run into packs of dogs roaming around. Packs of dogs will do things that a solo dog might never consider.
It still happens in developed countries, but it's far more common these days to see it in poor, developing countries. They probably don't have the infrastructure to collect relevant statistics, either.
These days, Americans mostly treat their dog like a family member. If you travel to developing nations, you're far more likely to run into packs of dogs roaming around. Packs of dogs will do things that a solo dog might never consider.
It still happens in developed countries, but it's far more common these days to see it in poor, developing countries. They probably don't have the infrastructure to collect relevant statistics, either.