Knew about this ages ago if any feed products say animal derevitives and or does not list the actual animals in the feed ie chicken, beef, salmon etc then this can contain meat recovered from all sorts of places including euthanized cats, dogs, horses and anything else they can get hold of. Rules were tightened aftrer the mad moo disease but a lot of the base for feeds is made in europe where the rules are a lot less strict. Feed your dogs biscuits that have an exact ingredients list ie Skinners, Chudleys or even Wagg all these brands and probably a couple more have a clear list of whats in it