
Hi, I feed raw, but no, not all the nutrients are lost in cooking, or else all us humans would be at deaths door!
What i would say though, is just cook the meat as little as possible, and mix in plenty of pureed veg, a good variety. There is no need to cook the veg, and yes, cooking veg will remove the majority of the nutrients from it. (Unless u just lightly steam them) Cooked veg taht is NOT blended is of very little use to a dog, as although once broken down they can digest the nutrients, they CANNOT digest the tough cell walls in plants.
Em