You've prompted some research with this speculative figure, Philip.

According to dogster.com (yes, it really exists)

"There are approximately 900 million dogs across the globe, either being kept as pets, living in wild packs, or fending for themselves as strays."

For my reincarnation as a dog, I'm torn between the 'wild pack' option, which sounds fun in a Hell's Angels kinda way, or the antisocial stray roaming the fringes of society.

Maybe I can switch between the two, in a Patrick Swayze in Point Break/Road House style.

But I insist on being a Border Collie rather than a dumb Labrador.