Leonberger Databases

There are several databases on the web.
The International Leonberger Union doesn't keep a database.

An international privately kept leonberger database :
http://leonberger-database.com/


In some countries clubs have an online database:

Czech Republic

Great Brittain

Kennel club databases:
Austria: https://oekv.at/de/referate/zuchtbuchreferat/
Finland:
https://jalostus.kennelliitto.fi/frmEtusivu.aspx
Italy: http://www.enci.it/libro-genealogico/libro-genealogico-on-line
Netherlands: https://www.dutchdogdata.nl/
Sweden: https://hundar.skk.se/hunddata/