1- Is it ok to still feed the Innova? Like I do now, kibble in the morning and a patty in the evening? I really like this routine.
Yep, that routine is just fine!
2- So are they really RAW? When I made his patties before, I would poach them in boiling water before I gave them to him. There is just something about 'raw' that scares me. Could I do this with the raw patties too?
They are raw. I would not cook them, bc then you're killing all enzymes and other things that are the benefits of raw meat. If raw gives you the willies, then I'd recommend just feeding a good canned or a "meat roll" or something. Those are balanced for canines too.
3- Does he need to be on any type of supplement? My hollistic vet recommends always having a supplement. He suggests Vim and Vigor.
Doesn't need to be, but many still give supps. Nothing wrong w/ it as long as you're not giving too much calcium or phosphorous, most importantly. I like Dogzymes Ultimate from Nature's Farmacy bc it is self-limiting, meaning the dog's body only draws what it is lacking from the supplement. I also give EFAs right now bc Marcel has some atopy going on.
4- Which one should I buy? Chicken, beef, venison, rabbit, so many choices!!!
Don't get rabbit - they get it from China, which is terrible. The other ones are still sourced acceptably, relatively speaking. The organic chicken is often THE favorite of dogs. Lamb and venison is nice.
5- Is this something I should make a gradual switch to, like any other time you switch foods? How would I go about that?
With raw, you should just "start 'er up" - if it were me, I'd just start that evening meal and go for it. Rarely, you will see stool issues - they shouldn't last more than a 2-4 days, if at all. You should not see vomiting.
Hope that helps!