Reference for Shabbat 24:4
מְחַתְּכִין אֶת הַדְּלוּעִין לִפְנֵי הַבְּהֵמָה, וְאֶת הַנְּבֵלָה לִפְנֵי הַכְּלָבִים. רַבִּי יְהוּדָה אוֹמֵר, אִם לֹא הָיְתָה נְבֵלָה מֵעֶרֶב שַׁבָּת, אֲסוּרָה, לְפִי שֶׁאֵינָהּ מִן הַמּוּכָן:
It is permitted to cut [non-rooted] gourds before a beast, [even though they are generally not eaten by beasts but by men], and (it is permitted to cut) carrion [which became carrion on Shabbath] before dogs, [even though ben hashmashoth (twilight on Sabbath eve) it stood (to be eaten) by men and not by beasts.] R. Yehudah says: If it were not carrion from Sabbath eve, it is forbidden, not having been muchan "ready for use"). [For everything that is fit for human consumption is not set aside for beasts. And even if the animal were sick on Sabbath eve, it is felt that it will recover. The halachah is not in accordance with R. Yehudah.]