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Rabah bar Rav Huna explains that the Mishnah in Shabbos (106a) which forbids trapping a bird even when it is already in an enclosed area (such as a house) refers to a "Tzipor Dror." RASHI (DH b'Tzipor Dror) explains that the reason why the bird is not considered already captured while it is in the house is because it flies from one corner of the house to the other and escapes one's attempt to capture it.
Rashi earlier (DH Chayav), however, explains that the bird mentioned in the Mishnah is not considered captured because it escapes through the windows, and not because it flees from corner to corner. Why does Rashi give a different explanation for why the bird is not considered captured while it is in the house?
The Gemara initially suggests that the difference between the state of being captured and the state of being free depends on the type of enclosure in which the bird is found.
We look at the issue of Pets and the ambivalent attitude to dogs in particular.