Traveling with animals, requires a bit more preparation. Afterall you want them to be safe and return healthy.
It's easier to travel EU with a dog, cat or ferret. (up to 5 animals and older then 16 weeks)
Mandatory
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Chip
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Vacination rabies
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Recent treatement for tapeworm
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International animal pasport
Recommended
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Health certificate
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Usual food
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Pet medical aid kit
Consider
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GPS tracker
For other animals you will need to investigate.
Check rules and Tips for Travelling to Europe With Pets and EU rules on travelling with pets and other animals in the EU and EU countries' specific information.