from what i know it's not legal in Europe.
I've been in Europe a few times...........but always brought my four legs boys with me.
This was possible because i always rented homes, apartments and not hotels.
I guess you have had your holliday allready. But as far as i know it's still legal in denmark.
In my country btw are many owners who like to share their friends. As soon as i have mine your welcome here as well..?