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Denmark
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Cicaro Suavis  

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Od Brdské studánky

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Belunan

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Always Sunshine
Leo Amicanis
Sconfinato

Italy
Daunbailoo
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Norway
Kennel West Leo Paws

Russia
Kennel  Dobryi Leonid

Sweden
Altonastigens
Dragongĺrden

USA
Leos From The Lion's Den
Von Alpensee

Other relevant leonberger pages.
Internationale Union für Leonberger Hunde
Independent Leo Gazette
Leonberger Databasen

Other dog pages.
Federation Cynologique Internationale

Danish Kennel Club