"Exploratorul are un câine negru și puternic."
Translation:The explorer has a black and strong dog.
This is not a natural English sentence. There is a specific order for English adjectives, strong should be before black: "The explorer has a strong, black dog" is the grammatically correct version of this sentence.
I agree, I answered the same. Sequence of adjectives is English is usually 'physical quality', then 'colour'.