I appreciate your reasoned answer, and certainly wouldn’t say the food is bad!
Having had a Spaniel living with epi for eight years, uk and US vets hadn’t much idea over correct diet until referred them to current research on Epi4dogs website, Hill’s ID with cereals and chicken is unsuitable but regularly suggested. My cocker with kidney problems refused the bland renal tins, and the vet could only suggest to google homemade.
I just recently groaned at a display of RC ‘Cocker recipe’ next to Schnauzer and Westie terrier versions...dogs of similar size teeth and weight.
Rhodri0311.. why not email for small samples from Millie’s Wolfheart or Eden? Their websites are good reading, and they are happy to talk about the different ingredients on the phone. Mine loved both .