שולחן ערוך אורח חיים · סימן תקכ״ג

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1. Laws regarding animals on the holiday, 4 Seifim: We remove flies that are stuck on an animal, even though this creates a wound.

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2. We do not comb an animal with a fine comb on a holiday because this removes hair.

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3. We do not deliver an animal on a holiday, but we assist it by holding the newborn such that it does not fall on the ground, blowing in its nose, and putting the teat into its mouth.

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4. If an animal spurns its newborn, it is permitted to sprinkle (meaning to pour) the water of the after-birth on it and put salt in her womb so that she will have mercy on it. It is forbidden to do this for an impure animal. Rem"a: (And see above chapter 246 paragraph 3 in the Rem"a's note regarding whether a man is commanded to let his animal rest on a holiday).