Bring your dog. It is really no problem. We brought our dog and take him back and forth when we want. If you are coming from the US you will need:
1. Proof of up to date vaccinations,
2. Proof of rabies vac. with in one year (most important, we had to delay 2 weeks because of this one) and it must be a one year vac, and not the three year one
3. Letter of good health from your vet ( it is a standard form) and must be stamped by the USDA. This is easy as you can use overnight mail service if you are crunched for time.
This must be 30 days or less from your flight time. If you can get this wihtin two weeks it would be better
4. A $10 fee (donation) to the customs folks here in the DR.
It took about 5 minutes to clear our dog. He actually got his papers before we got our luggage.
PM me if you have other questions.
Bob K