Translation:The cat won't find meat in the fridge; it isn't very smart, after all.
Agreed. The sentence I submitted was almost the same: "The cat is not going to find meat in the refrigerator, it's not very smart after all." Both our entries are essentially the same as the accepted one, just using standard alternate wordings. There isn't anything unusual or controversial about them. I wonder if there's any natural-language analysis in their algorithm, or if it's simply matching a submitted response word-for-word to items in a table of accepted responses. I suspect it's more like the latter, but who knows. If so, that would make it harder to maintain and improve long-term, мне кажется.
But the Russian told us that it is a male cat, didn't it? Since we were initially taught the word for a female cat, I was rather supposing that this was the "default" gender for a cat in Russian. But maybe that is a bad assumption. We've been given only one word for мышь, which is feminine. Is there a specific word for a male mouse that we haven't learned. Certainly there are plenty of animals in English where the "default" version is the feminine form (think of cow vs bull), and I was guessing that this might be the same with cats in Russian.