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Ideas of Mnesarchus, by Text

[Greek, 160 - 100 BCE, Joint Head of the Stoic school in Athens.]

120BCE fragments/reports
p.168 If someone squashed a horse to make a dog, something new would now exist
     Full Idea: If, for the sake of argument, someone were to mould a horse, squash it, then make a dog, it would be reasonable for us on seeing this to say that this previously did not exist but now does exist.
     From: Mnesarchus (fragments/reports [c.120 BCE]), quoted by John Stobaeus - Anthology 179.11
     A reaction: Locke would say it is new, because the substance is the same, but a new life now exists. A sword could cease to exist and become a new ploughshare, I would think. Apply this to the Ship of Theseus. Is form more important than substance?