I recently read Plant Powered Dog by Diana Laverdure-Dunetz, MS and W. Jean Dodds, DVM.  It is a wealth of scientific insights with hundreds of citations, easy to understand in-depth background on nutritional science, the basics of building a nutritionally complete canine recipe, numerous basic recipes, and specific chapters for nutrition for various canine health issues including cancer. 

I've had our 3 dogs on a mostly plant-based diet for 3 years, but we'd gotten away from fresh home-cooked/prepared meals over the previous year due to travelling, and we had even been mixing meat-based kibble with the plant-based kibble due to convenience.  When Galaxy became lame I knew I had to get back to fresh home prepared meals but needed the science as well as science-backed recipes.  The book completely delivers in spades.  Based on the different canine cancer resources I've been reading over the past 3 months I'd begun to waffle on whether plant-based was best for a dog battling cancer, but after reading The Plant Powered Dog, I'm convinced eating as low on the food chain ladder as possible is not only her best diet to battle cancer but also best for all of our dogs' overall health.  

Also, Diana provides private consults and  prescribes personalized diets for dogs.  If you're interested, you can find her contact information at https://plantpo.....ddog.com 

I hope this is helpful to someone.  

I'm interested in others' experience with plant-based diets for dogs, especially dealing with cancer.