CRUISING WITH DOGS
The official proceedure can be found in most cruising guides. You are supposed to get a vet certificate (I think it must be done within 24 hours of leaving port), sail to a port of entry, and then show the vet certificate to the customs official and pay a small fee.
We could not get a vet certificate before leaving, but the customs official couldn''t care less. He stamped the "official" certificate we made on our computer, took our money, and said "welcome to the Bahamas, mon." I don''t think you will find anyone who cares; we sure didn''t.