Cats: I solved the blood on stool issue. It was definitely Pumpkin. I added 1 TB of soaked chia seeds to their raw food mix (enough for 3-5 days depending on how much meat comes in the pack) and mixed in two chicken livers (so they each get one whole liver per week). No more blood and I can see that there's lots of hair in the stool. I think she was getting constipated trying to pass the hair instead of coughing it up as a hairball.
Also, I figured out that Fae has asthma! She rarely has an attack, but it sounds just like the cat in this video.
Another Furball? Might Be Feline Asthma - Feline Nutrition