That's a very good question. Vitamin C is damaged by cooking, although the B vitamins are generally not affected. There is a good table here:
http://www.beyondveg.com/tu-j-l/raw-...ooked-2e.shtml
Mineral loss in cooking is minimal. See this page:
http://www.beyondveg.com/tu-j-l/raw-...ooked-2g.shtml
So cooking your meat and vegetables will not damage much, except for vitamin C and thiamine. Now regarding the question of cooking versus not cooking, most pet owners prefer to give their pets commercial pet food (which is cooked), or (like me) cook their own food for their pets. I do a mix of meat and vegetables, with the meat well cooked to kill any parasites (tape worms especially) and bacteria, and with the vegetables lightly cooked.
I would not recommend raw fish for cats. See
http://pets.webmd.com/cats/ss/slides...ould-never-eat
Some people do give their pets raw meat, believing that this is more natural and contains more goodness. That is their choice and I do not criticise it. One of our esteemed fellow admins, Frolicking Ferrets, is an advocate of raw meat for dogs. I will not not enter into a long discussion here of the merits of to cook or not to cook. All I will say is that I choose to cook the meat, as I do not want my dog to eat any living parasites; the eggs are so small that they cannot be seen easily with the naked eye.
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