Woo! So glad to hear it!
When Clue got here she was 10 weeks and about 8-9 lb. She couldn't handle full chicken backs at that point, so we rotated her through ground tripe, torn-apart backs, chicken hearts/gizzards, and a little bit of veggie mash that was mostly hamburger. She chewed on pork neckbones, so got a little bit of pork that way. When she was about 4 months, I found a great slaughterhouse that would let me take scraps, so we moved to whole tripe chunks and lung pieces, bigger heart pieces, liver, etc. Still tore apart the backs at that point. She started being able to handle whole backs when she was maybe 6 months old.
Right now she's 8 months and maybe 30ish? 25ish? lb and gets maybe 3/4 lb a day total in food. She's at a really good weight and the difference that I've noticed between her and the other puppies out there is that she's much "harder"--more put together; moves as one piece, not floppy. That's good genetics (I love her breeder) but it's also the increased muscle tone and decreased fat of a raw diet. Her coat is also BEAUTIFUL. Again, genetics, but each hair shaft is hard and shiny, so it does what it is supposed to and lies down on her jacket and is much fuller on the furnishings. Now with a Pem you're going to want a much fuller sihouette after grooming (do you have a high-velocity dryer yet?) so you'll be using more product and trying to get the guard hairs to stand out more, but having a good hard hair to work with makes that easier too.