"Imagine waking up in the morning and coming down to the kitchen to make
yourself breakfast. You take some soybean grits, mix them with some
tainted cattle-meat meal, throw in a few beaks and feathers, smother
your concoction with processed sugar syrup and chemicals, then sprinkle
on a few preservatives and dyes. Pressure-cook the hell out of it, let
it cool - then dig in!

What if you were told that this is exactly what you'd eat at every meal
for the rest of your life? Is it any wonder our pets have degenerative
diseases? That so many get cancer? That so many die before their time?

The poisoning of pet food meat begins with the hormones fed to livestock
to make them grow faster, so they can be slaughtered that much sooner.
Laboratory animals have developed cancers when fed proportionately as
many hormones as livestock is.

A pet fed the same diet of antibiotic-laced substandard meat every day
is at a far greater risk of cancer than a person eating choice cuts on
an occasional basis. The direly sick animals who collapse from one
disease or another and, as a result, never reach the slaughterhouse -
these are the animals deemed unfit for human consumption, killed, and
sent off to "rendering" plants which supply meat protein used in pet food."

The above text is from
Food is Everything