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Beit Midrash
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- The Melachot
Answer: At first glance, whether you violated tzad (trapping) with your cage is the subject of a machloket between Beit Shammai and Beit Hillel (Shabbat 17b). The former says that one may not put out traps before Shabbat unless he can assume the prey will be caught before Shabbat. Beit Hillel, like whom we pasken, says a broad rule that one does not violate melachot on Shabbat when the apparatus he set up before Shabbat "works" on Shabbat. (It is not clear that Beit Shammai refers to placing a trap several days before Shabbat, as the chances the animal will be caught on Shabbat are small – see Meiri ad loc.). In certain cases, Beit Hillel prohibits Rabbinically setting up such a system, due to concern the situation will cause one to personally mistakenly violate Shabbat. For example, it is forbidden to keep partially cooked food on the flame on Shabbat unless one does something to mitigate the chance of mistake (Shabbat 36b). Chazal did not find grounds for such a gezeira here.
Indeed, some melachot come in pairs, but the list (Shabbat 73a) does not include a counterpart to tzad. Usually, undoing a melacha is forbidden when it is preparatory to redoing the main melacha. I sewed poorly, so I rip the stitches to redo them. The wall is weak, so I take it down to redo. There may also be cases where the "undoing" has special significance, like extinguishing a fire in order to use the ashes (see Rambam, Shabbat 12:2). The classic case of tzad is normally to trap something in order to kill it and use the carcass, and Chazal did not view letting an animal free as connected to the possibility of re-trapping or something significant and/or related to construction of the Mishkan.
Animals are muktzeh on Shabbat (Beitza 2a). Although you were happy the mouse found was contained in the cage (see Mishna Berura 309:27), it did not become a permanent bassis l’davar ha’asur because the mouse was not there when Shabbat started (Shulchan Aruch, Orach Chayim 310:7); there may be other reasons for this determination (see Shulchan Aruch, OC 309:4 and Mishna Berura 309:21).
The cage not being a bassis is of limited value because when you carried it, the mouse was still there. In such cases, one may move the cage only under specific circumstances (see details in Shemirat Shabbat K’hilchata 20:47). We have to divide your case into two possibilities. If you would have let the mouse out even if you would not be allowed to take the cage outside, then moving it was for your sake, to remove the mouse from your house. If so, you could have moved indirectly, e.g., carrying by means of a permitted utensil (Shulchan Aruch, OC 311:8).
If you would not have let out the mouse in the house, moving indirectly is not enough, because you are moving it for the sake of the muktzeh item (ibid.) – getting it somewhere you could release it. Let us assume (I lack expertise to determine if keeping a mouse in a small cage is tza’ar ba’alei chayim (=tbc)) that there was tbc. Does it help? The gemara (Shabbat 128b) allows placing cushions under an animal to alleviate its pain, as tbc overcomes the Rabbinic prohibition of mevatel kli meiheichano. There is a machloket if tbc also waives muktzeh (Mishna Berura 305:70), and it is hard to give a broad ruling (see Shemirat Shabbat K’hilchata 27:54). Perhaps it might have helped to put something not muktzeh of more value on the cage (see Mishna Berura 310:37; Shulchan Aruch, OC 309:3) before moving it. There are serious complicating factors (beyond our scope - see Orchot Shabbat 19:288; Living the Halachic Process II, C-21), but in the face of tbc, it might be justified.
Bemare Habazak - Rabbis Questions (654)
Rabbi Daniel Mann
405 - How to Determine when Paying on Time Is
406 - Trapping and Releasing on Shabbat
407 - Backing Out of a Pledge to a Jewish School
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Bemare Habazak - Rabbis Questions Ask the Rabbi: Having a Non-Jew Build a Sukka and Assemble Arba’a Minim
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