"Это моя собака."
Translation:This is my dog.
December 16, 2015
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Because "эта собака " is "this dog " or "that dog". "Это" is used to mean "that/this/it is" or as a demonstrative pronoun for neuter nouns. "Собака " is a feminine noun, so "это" will never serve as a demonstrative pronoun for it. Check out this guide if you need more help/clarifications :)