Моя собака быстро реагирует на любой шум.

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Breakdown of Моя собака быстро реагирует на любой шум.

• собака: the dog
• на: to
• быстро: quickly

Questions & Answers about Моя собака быстро реагирует на любой шум.

Why is it моя собака and not мой собака?

In Russian, possessive pronouns agree in gender, number, and case with the noun they modify.

• собака is grammatically feminine (ending in -а).
• Therefore, you must use the feminine form моя (my), not the masculine мой.

So:

• моя собака = my dog (feminine noun)
• мой кот = my cat (masculine noun)
• моё окно = my window (neuter noun)
• мои собаки = my dogs (plural)

But a dog can be male. Why is собака feminine?

Russian has grammatical gender, which doesn’t always match biological sex.

• The noun собака is grammatically feminine, no matter whether the actual dog is male or female.
• You still have to use feminine agreement: моя собака, эта собака, умная собака.

If you specifically want to say a male dog, you can use:

• пёс (male dog) → мой пёс
• кобель (more technical, “stud dog”) → мой кобель

But in everyday speech, собака is the default word for “dog” and is always treated as feminine grammatically.

What form is реагирует, and what is the infinitive?