What San Diego neighborhood has the highest percentage of pet registrations?

While nearly every large county in Califronia has a requirement to register pets, and therefore has pet registration data, I could not find any county or state that publishes pet registration data. The closest I could find is the APPA National Pet Owners Survey, which costs $3,500 for non-members.

This sort of question seems obviously easy to answer, but unfortunately, and oddly, it is not.