sorry I just noticed your question 2 days late. Glad to help. I have a lab, too. Was a 5 min process after I went through customs.
Belize Agricultural Health Authority (BAHA). It was an easy process. Call the number below and they will tell you what you need to fax them for the permit (info about your dog...breed, age, sex, etc...)
Requirements:
Domestic pets will be allowed to enter the country provided that owners present the following:
valid import permit
international veterinary certificate (needed 7 days prior to departure)
valid rabies vaccination certificate
inspection by quarantine officer
US $30 entry fee + US $12.50 fax fee
Import Permits
To apply for an import permit,
request application form from:
Permit Unit
Belize Agricultural Health Authority (BAHA)
Belmopan Showgrounds
Belmopan City
Tel: 822-0197 or 822-0818
Fax: 822-3084
Email: baha@btl.net
return completed form to Permit Unit of BAHA (Note: date of arrival must be specified)
Approved permits will be faxed to applicant at a cost of US $12.50 to be paid at the point of entry on the day of arrival.
Persons who forego the application process will be subject to a US $100.00 violation fine in addition to the US $30 entry fee.