I am posting this link to a BBC news item because it fits with the spam Facebook meme about rock salt killing pets.
Dog evolved 'on the waste dump'
So we're all clear on this now, dogs can taste and break down starches, but cats cannot.* Also, cats are mostly evil**
Pic - Boeotian terracotta figurine of a dog holding a small animal in its mouth. Greek, Archaic, ca. 550-525 BCE
*Well researched academically proven facts
**Author's first hand experience