From: Rich Gauszka 

a change in regulation seems to be in order

http://www.nytimes.com/2007/03/25/weekinreview/25basics.html?ref=us

Pet food is regulated by the F.D.A. through the same state agencies that
regulate food for farm animals. But product excluded from animal feed can
go into pet food — meat and bone meal, nervous system tissue — parts of
animals not allowed for anything else. There were cases of mad-cow disease
in cats in England. The opportunity for cheap byproducts is much greater in
pet foods. The assumption is that better brands don’t do that, but it’s not
verified.

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