first and foremost I'm sorry to hear about your pups cancer, good vibes your way all day long. I would say that obviously a BARF diet wont cure that problem but I've seen the benefits first hand with an older dog and I'm sure she would benefit and feel better even with her cancer. The best advice i can give you is dont worry, raw feeding is easy as pie. Get meat, put meat in bowl, done. simples. There is the 80/10/10 ratio but its far from set in stone, just watch the poo. if you see dry crumbly poo, reduce the bone, if its sloppy then give less organ meat, if it is bright yellow (and it will be) then that's chicken. Start with chicken. its easy for dogs to digest. I personally do give a starve day before swapping to raw to make sure the pooch is good and hungry and free of most of the kibble before they get raw. Plenty of people don't do this starve day and no negative consequences either way. if yo are unsure about it all most pet shops will stock a prepackaged mince with the correct ratios. It is more expensive than going DIY but its a good way to lower your self in. When you have found your feet you can start looking for dedicated pet food suppliers or asking butchers for freebies and keeping an eye out for discounted meet in the shops (I always found Ox tail cheap as chips) Stay away from bleached white tripe. It has almost no benefit compared to green tripe. But I would recommend avoiding green tripe too until you are ready for the smell. If you have a gulper on your hands then I would recommend feeding blocks of mince frozen or partially frozen, this encourages them to chew. once she has learned to chew her food properly then I would move on to chicken legs or pork ribs. i hope that helps a little.