Regulatuion acts for animal health conditions and certification for certain products and transit cargo to be temporary stored in the Community you can find here

Consignments of animal products in transit are required to meet animal health requirements. In addition consignments destined to third countries have to come from a third country whose products are not specifically prohibited entry.

Live animals physically entering the territory of the EU must always fulfil EU animal and public health import requirements, whether for import or transit!