In Russian, animals have grammatical gender, just like any other noun; regardless of the animal's actual sex. Adjectives and verbs should match this 'gender'.
For instance, when describing a dog, you may say <<У меня милая собака.>> ("I have a cute dog.") The feminine ending of -ая is used even if this specific dog is a biological male!
Similarily, some animals have a different word to differentiate gender (think cow/bull or lion/lioness in English.)
Some common examples would include...
• кошка (female cat) --> кот (male cat)
• собака (female dog) --> пёс (male dog)
• курица (hen) --> петух (rooster)
• корова (cow) --> бык (bull)




