Your little Louie is same age as my little Duke. Duke was on raw, tripe n for the free feed throughout the day was Acana chicken . Duke is like either scoupable or extremely soft. I weaned him off raw and now on HK with Puppy Acana chicken. Basically I want both pups eating the same and not 20 different meals to prep. I also give him sauerkraut and pumpkin to control the diarrhea. He is much better than last week. He eats 3.5 cups a day. His HK is split in 3 n he gets 3x 1/2 cup of puppy Acana. I noticed I cant introduce him to new stuff too fast. He ends up with diarrhea. Stay on Louie's breeder's schedule for another week so he gets use to his new life. 2nd week with Duke and I see the difference. I was worried too about bright blood in his stool. Boils down was just stress. New home, new sister, new parents, new backyard et etc. If you want to change his food wait another week or so. Just remove a bit of his kibbles.... NOT all and add raw if that's what your goal is like jax.