First hit on duckduckgo was that the US spends $60 billion a year on pets, and with falling population growth I'd expect a similar number in the EU and any other wealthy country with relatively few children. Of course expecting a person to fork over the big bucks on a "designer pet" assumes that either they've had pets before (and understand just how much they cost) and/or they are sufficiently fashionable to justify forking over big bucks to keep up with the Joneses.