In France, your dog will need to either be in a closed carrier, or muzzled and on a lead. And you need to pay €7.
This page is pretty comprehensive, you should be able to right-click to translate it if necessary.
https://www.sncf-voyageurs.com/fr/voyagez-avec-nous/preparez-votre-voyage/voyagez-avec-votre-animal-domestique/

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