[nemomarx]

We've been keeping pets as a species for considerably longer than we've had cities. It's basically an ingrained part of how we react to animals now.

[wafflemaker]

In dwarf fortress you can have dragons as pets. Never got there, tho I think I will train dogs in my current fortress.

[manarth]

Sadly not known to breathe fire, but on the plus side, less likely to burn your house down: https://en.wikipedia.org/wiki/Pogona

[lenerdenator]

Beyond that, longer than we've had the written word.

Domestication of animals might be the single greatest achievement of humans.