In Spain, "pan de perro" is mentioned as early as 1623 in a play by Lope de Vega. It is used here in the sense of giving someone blows; to "give dog's bread" to someone could mean anything from mistreating them to killing them. The latter meaning refers to a special bread (also called zarazas) made with ground glass, poison and needles and intended to kill dogs.
The point of homemade dog treats is to stay away from preservatives, chemicals, dyes and all the other nonsense. Be smart. Do extensive research on the ingredients you wish to use and the alternative to each of them. Even if you think your dog has a ‘tolerance’ for milk, you should use it regardless unless you 100% know of any additives. In that case I just take milk right out of the equation. Theres no need for it anyway.
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