How Many Are Those Doggies In the Window?

The only semi-reliable source I was able to find on the total population of dogs on Earth places the number at around 400 million. That book, however, doesn't explain how it arrived at that figure, and it does warn that the estimate could be off fairly significantly.

Here's a map the top ten pet dog populations by country (although there's no source on this map's estimates, so caveat emptor):


Also, some dogs do not bark. That's why, in the inductive argument we discussed in class, I was careful to conclude only that "Most dogs bark," not "All dogs bark."

One more random fun fact: they used 217 dalmations to film the live-action remake of 101 Dalmations.

Hey, this is too much focus on dogs for my taste.