I wouldn't have believed this, but I have about 40 free range chickens and I also raised pastured meat birds. They have acres to roam and live in harmony with 3 dogs and 2 cats. One of my cats just playful pounced around behind one of my Rhode Island Red hens and it ran a few feet and then ruffled up, opened its wings as if preparing to be mounted by the rooster and laid down on the ground for the cat. The cat sniffed at a distance and lost interest and laid down next to it in loaf form. The chicken looked around a little and then started twitching a little, which I thought it was ready to stand back up and then went motionless. Then the cats both went over to sniff it but this time they sniffed its face and it remained motionless. It was dead! A health 3 year old RIR that's been through 2 fox attacks previous years. Dead from a silly kitten chase.
It's never easy losing a beloved pet.