Hi folks, thanks for your support and comments.
Well today I have thought long and hard about whether to stick with Burns or not. I know Burns has quality ingredients but there is something about the food I am not sure about. AFAIK, John Burns suggested to his customers (when he was a practising vet) if their dog had a poor coat or diarrhoea, etc to get off the commercial food they were on and cook the dog boiled chicken & rice. This was how Burns food started. What I am wondering about is: chicken (Burns has 20%) and rice (Burns has 60% rice) is good for your dog now and again if the dog is unwell but not all the time. Its a bit like going on a porridge diet or the Atkins diet - works for a while but never lasts and is defintely not good for your health in the long run.
Darby's liver problem might not be related to his diet but his anal glands are. Incidentally my Mum's dog got sick last week aswell - he is on Burns and he had problems with his anal glands too. (And she decided to change to a new food.)
I am based in Ireland and I bought a bag of Red Mills Leader today (Irish dog food). So I am going to change my 3 cockers over to that and see how we go.
My opinion of holistic foods (Burns, Land Of Holistic, etc.) has changed. When I was checking out alternative foods last night alot of the BIG names - Royal Canin, Hills, JWB, Arden Grange - all had similar ingredients. Ingredients that the holistic foods say a big NO too - like maize, beet plup, poultry fat, etc. I wonder who is right? I can't even rely on my local vet clinic for advice! One of the vets suggested Pedigree before! It's confusing to say the least.
Anyways thanks again for the comments. Hopefully Darby will get better soon. I'll keep you posted. Thanks Paul - and Darby, Clara and Kelly (my 3 cockers).