My elderly (foster)parents have a 300 acre farm that's been in their family for generations. Except for a handful of sheep, they no longer farm. They have 40-60 cats, very few healthy, most are feral, all appear to have lice/fleas/mites, and many have cold symptoms (eyes matted with discharge, runny nose, cough). Those with the cold symptoms usually die, but they die a slow, painful death. I want to know if there is a painless way to euthanize the sick ones. Again, most are feral so can't be caught. Someone recommended using rat poison and they would bleed to death -- is that a slow, painful way to die?