Hi, Ivan! For animals, if we do know for sure their name and/or sex (male or female) we should use “He/She” Only use “it”if you are uncertain about the animal’s sex. As for inanimate objects, always use “it” to refer to them. Hope this helps you have a better idea of this! I invite you to check out my profile, since I am a teacher here on iTalki, and together we can answer more questions like this.

English doesn't have gender any more (maybe one or 2 exceptions), unless you know the gender of the object, as Lauren and Andres have said. He or she for the dog, depending if it is a male or female dog. E.g Our dog hid himself as soon as he heard us getting the bath ready. Himself or herself, depending on your dog. My brain needed time to process some information... It needed a rest from thinking Russian today. )) My brain needs a rest from a busy day - it. Neither male nor female.

Our dog (he)--since it's your dog, we assume you know if it's a male or a female dog. The brain--"it" is correct.

(It) is right word for animals os subjects such as non living

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