Dog-Friendly Fountain of Youth in St. Augustine Florida. Dog-friendly vacations are the best when your dog can participate in tourist attractions. During my stay in St. Augustine, Dexter and I visitied the Fountain of Youth. #raisingyourpetsnaturally #fountainofyouth #staugustine #visitstaugustine #dogfriendlystaugustine #dogfriendlyflorida