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CaseSingularPlural
Nominativeименительный · кто? что?собака собаки the subject: who or what acts
Accusativeвинительный · кого? что?собаку собак the direct object of the verb
Genitiveродительный · кого? чего?собаки собак possession, absence, "of"-phrases
Dativeдательный · кому? чему?собаке собакам the receiver: to or for someone
Instrumentalтворительный · кем? чем?собакой собаками the tool or companion: with, by
Prepositionalпредложный · о ком? о чём?собаке собаках location and topics: in, at, about

Собака is a feminine noun; the ending pattern above repeats across most feminine nouns, so every table you learn makes the next one cheaper.

Look up any other word in the Russian declension tool, see where собака ranks in the most common Russian words, or start from Russian cases explained if the table above is new territory. More vocabulary lives in Russian words by topic and Russian phrases.

12 forms is a table. Using them is a skill.

Slova drills собака and every word like it with typed case endings, checked letter by letter.

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