WordNet records no synonym and no antonym for bernese mountain dog. It is the only member of its synset, which is common for technical, taxonomic and single-sense vocabulary — there is no other English word that means the same thing. The broader and narrower terms below are the useful relations in that case.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
large powerful long-haired black-coated Swiss dog with deep tan or russet markings on legs and white blaze and feet and chest marking; formerly used for draft
Synonyms, antonyms and the broader and narrower relations for bernese mountain dog come from Princeton University’s WordNet. Full sources and licences.