"Ja nie znam tego psa."
Translation:I do not know this dog.
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What you have here, is that you had a sentence that took Accusative, and then after negating, it takes Genitive. It is very common, but if a different case is negated, the case just stays. Negated Genitive is Genitive, negated Instrumental is Instrumental, etc.
I think masculine animate nouns have (mostly) an identical Genitive and Accusative form, so does masculine personal plural, but mostly it's different.
Polish and English words have different distance. Polish has ten, ten ,tamten English has this, that that
About why here are some explanations:
https://www.duolingo.com/comment/13490111$comment_id=13492303 https://www.duolingo.com/comment/14767501$comment_id=14771163
Your answer looks perfect.
So there are two options: the most common is that you answered perfectly in the comment but during the exercise you actually made some error (even just a typo). The second is that there was some bug which caused your answer to be rejected, but we'd need a report and/or a screenshot to figure that out.