I would stick with Fromm. Taste of the Wild is manufactured by Diamond, and while the food is good, the company is pretty shady and has a long history of recalls. A lot of people here recommend a rotational diet with kibble, there’s a few threads on it around you may be interested in 🙂
As for feeding raw. I personally wouldn’t mix them in the same meal, as this can give some dogs digestive upset. I would feed one meal as kibble, and one meal as raw. For raw, you want to feed him 2% of his body weight per day. So if you’re only feeding one meal of raw, cut that number in half. So since he is 100~lbs, he would need 2 lbs of food per day. Since he is only getting 1 meal a day of raw, that would be 1lb of food at his mealtime.
Start him out slow with just poultry for awhile to get his tummy used to it. Then you can gradually start introducing other meats like beef, pork, etc and organs, which are an important part of the diet. When feeding something bony like a turkey neck, add in some nice meaty meat like chicken breast or hearts (about half the weight of the bones worth) to cut the calcium and prevent constipation.
I currently feed my dog kibble in the morning and raw at night (next week we make the switch to full raw!!) and he does well on it.
For chews, you can try giving him a frozen turkey neck and let him work on that. It can keep a dog busy for hours.
You could also look into antlers, although I know some people have reservations over them being too hard.
This is a good thread to read to find some information on raw food – /forums/topic/menus/
