"You have a dog."
Translation:יש לכן כלב.
In Hebrew you have 4 types of 'you': singular masculine, singular feminine, plural masculine and plural feminine. The sentence can be translated to either:
singular masculine: yesh lecha kelev - יש לך כלב
singular feminine: yesh lach kelev - יש לך כלב
plural masculine: yesh lachem kelev - יש לכם כלב
plural feminine: yesh lachen kelev - יש לכן כלב
יש לכן כלבה Was not listed as an option for me. The only difference between the 'correct' answer and my answer is that my answer had nikkud on לך. The answer you wanted me to pick had no nikkud. And no gender was indicated. They both should be counted right because they were both essentially: יש לך כלבה