Pets are welcomed into Croatia as long as you have the following:

International Certificate of Health from an accredited veterinarian (in the US known as USDA Form 7001)

Micro-chipping details

Fitness To Fly certificate if arriving by air (required by most airlines)

The EU Pet Passport (for pets arriving from EU countries) is available for download at  http://www.europa.eu.net. (In order for the EU Pet Passport to be issued, the pet must be micro-chipped and vaccinated against rabies.) It will generally satisfy the entry requirements for importing a pet into Croatia.

There are a number of accredited veterinarians in most major Croatian cities. Veterinary care is limited on the islands and in smaller, rural communities.