Animates present an interesting problem in usually genderless English. So as usual. English has helper words to define the reproductive ability and biological sex of many animals. Tom is a fertile male cat. The words tom and cat should stand alone because in many cases the helper word applies to several species however tomcat is common and understood. A fertile female cat is called a queen. Cat by itself is usually regarded as genderless word.
We have to be careful however because a sow and boar relate to both pigs and bears and it is normal to use just sow and a boar when referring to pigs. If we are referring to bears, we are more likely to say male or female bear but you will hear "sow bear and the boar."
Aren't you glad you are studying Russian and not English?