My cats and chickens eat together all the time. We have to be careful not to feed the cats when the chickens are free-ranging or they will eat all the cat food. They live in harmony together.
I made my chickens a treat and set it in the midde of the lawn, not thinking I let the chihuahua out, after 10 mins in the 20 degrees weather I went out to look for her because noramally after I let her out she barks to come in 2 seconds later, well I had out there and I was shocked to see the chihuahua eating there treats with them an the cat drinking there water, and sleeping in the nesting boxes 20 mins later!!!!