I follow prey model style raw.
It is roughly 80% raw meat, 10% edible bones, 3-5% liver and 5-7% other organs.
Skin, fat, connective tissue and organs that are primarily muscle (heart, gizzards, tongue) all count as 'meat'!
Red meat is more nutritious than white.
For bones things like pork ribs, rabbit, poultry are ideal. Weight baring bones (elk, moose, cow legs etc) tend to be large and dense and are higher risk for chipping teeth.
I don't feed any grains, dairy or vegetables. As DevonW said they can't digest it, they don't need it.... they don't have molars to grind vegetables, they don't produce stomach acid or enzymes to break it down and digest it (their stomach acid can dissolve a bone... but not a carrot!! hmm).
Wild game or fish should be frozen for a minimum of three weeks to kill parasites. Pork sold for human consumption doesn't need to be frozen (only wild pig).
Fish isn't that nutrition and should be fed sparingly... if only for the occasional variety.
For supplements I add soy free salmon oil.. this replaces the Omega's lost in farmed meat. Not needed if you are feeding primarily wild meat. I also feed raw eggs
As a guide line you feed 2-3% of your dogs IDEAL ADULT body weight per day and adjust from there based on your dogs condition. Toy breeds, working/active breeds, pregnant or lactating *******, sick or underweight dogs might need 4-5%+; whereas giant breeds, couch potatoes, overweight and senior dogs may only require 1-2%. Each individuals diet must be tailored to suit their individual needs and work load. Puppies up to 6 months should be fed 3-4 times a day. 6 months+ 1-2 times per day.
The benefits are MANY! Besides mental stimulation, full body work out, variety and dental benefits... thicker nicer coats, less shedding, less pooping, small no odour poops, even growth, lean muscular bodies, good breath, no 'doggy' smell and improved energy levels. The difference between kibble and raw raised puppies is amazing! As previously mentioned they grow at an even rate... no lanky awkward stage. They also don't have pudgy fat rolls and have adult coats instead of puppy fuzzies from day one!
I used to feed BARF before I switched to prey model. That is where you add in rice, vegetables, fruits and a whole wack of supplements. I have defiantly seen an improvement in my dogs since switched to PMR... their poops are smaller which also tells me less waste! They are leaner and in overall better body condition.
And ALL meat and organs can be left uncovered in a fridge... it might dry out a bit but that won't bother the dog (I actually make fridge dried treats this way). You can also defrost and refreeze as many times as you wish. Feed frozen, semi thawed - whichever suits you. You can even feed freezer burned stuff, and expired meats.
It sounds more complicated than it is.. the idea is to create the balance over time. And adjust each dogs diet to suit their individual needs and work load.