All [actions that cause] spoilings [i.e. destructive work rather than productive work] are exempt [meaning forbidden on the sabbath but there is no punishment associated with them.] Rabbi Abahu taught in front of Rebbe Yochanan, 'All spoilings are exempt, except for causing wounds and burning.' Rabbe Yochanan replied, 'If you are going to teach that, go outside. Causing wounds and spoiling are not different'. [That is, you are wrong and can't teach that in here!] An alternative explanation is that causing a wound is different when it for the purpose of feeding [the blood] to one's dog....
So I guess before dog biscuits they used blood as a canine snack.
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