I don't really know why a dog needs to be licensed in Jacksonville. I have a microchip inside my dog that will lead me to it, and the dog also wears a collar with contact information for our household. We have the documents stating the dog has three years of rabies shots, but we did not have a tag for Duval County. And that's probably the reason to get licensed, not that I've ever heard of animal control shooting a dog for not having tags in Jacksonville. Anyhow, the wife says we need a licensed dog, so for $20 a year, I figure that's the least of our dog-related expenses.