I see your problem... you need more education as to what nutrients are, and which ones are affected by cooking. That is not a big deal, but perhaps you should stop giving advice until your knowledge of science in such matter catches up to your opinions..
A nutrient is a chemical that an organism needs to live and grow or a substance used in an organism's metabolism which must be taken in from its environment.[1] Nutrients are the substances that enrich the body. They are used to build and repair tissues, regulate body processes and are converted to and used as energy. Methods for nutrient intake vary, with animals and protists consuming foods that are digested by an internal digestive system, but most plants ingest nutrients directly from the soil through their roots or from the atmosphere.
Organic nutrients include carbohydrates, fats, proteins (or their building blocks, amino acids), and vitamins. Inorganic chemical compounds such as dietary minerals, water, and oxygen may also be considered nutrients
So Calcium, is a nutrient, and is not 'cooked' out. In fact proteins and amino acids are not cooked out either. You cook a steak, and the protein and fats are still there, as are the individual amino acids. Most will be denatured, which simply means they have changed shape. They will still all be there, interestingly some cooked items are easier to digest, even for dogs.
Enzymes are the only thing that are harmed by cooking. Enzymes NEED to be in their correct shape to work. However many enzymes are destroyed by the stomach acid of the dog (or human) as they have optimal pH values so cooking is not a big deal in most cases.
When boiling foods some vitamins and minerals ARE leached out. That is why steaming is healthier. But many of the good things are still in there. And this is a main issue with plant matter, so not a big deal for dogs... If your meat looses some fats when cooking that is not a horrible thing
in many cases.
Then we have issues where food types can be beneficial outside of nutrients, like dental and digestive help. I have found bone to be one of the best things for keeping a dog's poop nice and firm. This is irregardless of cooked or not as its undigested calcium that does this. Just like undigestable or 'dietary' fibre for people.
That said I do prefer a raw diet for my guys. But I think a good diet of human grade non processed food is likely as good, or almost as good for dogs. I am not a canine nutritionist. I am however a biochemist and DO know what happens to proteins and enzymes when heat is applied and can tell you what happens down to the molecular level. I do have some education in animal physiology, as well as self researched topics in this area.