I did some quick math from numbers grabbed online, if someone has better data PLEASE correct me.

I used the number of 17.5 million dogs versus 1.8 million constrictor snakes.
You have a 1.8% chance of fatal dog attack versus 4.6% chance of fatal constrictor attack.
If anyone has a more accurate number on how many large constrictors are in the US (the figure used was merely the info on how many constrictors have been imported in the past 10 years, from PIJAC) then we would get a MUCH more accurate percentage. Obviously most of the imported constrictors were not giants, this figure does not include captive-bred animals, and this figure does not exclude animals that died after importation. In fact, 78% of those constrictors were ball pythons, so the percentage is probably much much higher in reality, even taking into consideration all the captive bred burms and retics.

Still, we do see the obvious--Fido is not as risky to keep as Big Bertha. We really did know that...didn't we? (I hope so).

I think one of the issues with coming up with accurate numbers here is that no one appears to have even the slightest clue how many giant constrictors are actually being kept in the US. If anyone has a BETTER estimate, or a more concrete number, please post it, and we can re-do the math.