As I said above thankyou for the info.
My mother has been doing it for dogs that need a bit more condition for 20 years and we have never had a problem with it.
She advised me to do it recently with one of my poodles that needed a little extra weight, she just didn't mention the good and bad fats.
If there is a question on this site I am unsure of I usually call her and ask her opinion.

She started an AMHD account but does not have time to come on here. (I think she has answered one question)