[If] a dog or a kid jumped off the top of a roof and broke vessels, [its owner] pays the full damages because they are muadin.  [If] a dog took a cake and went to a stack of grain, ate the cake and ignited the stack of grain —- for the cake, [its owner] pays the full damages; for the stack of grain, he pays half the damages.

Which is tam and which is muad? A muad is anyone that was warned three days; a tam —- when it refrains [from goring] for three days. [These are] the words of R' Yehudah. R' Meir says: A muad is one that was warned three times; a tam —- any one that the children touch and it does not gore.