We switched Bruce when he was 12 weeks old ( we had planned on doing it sooner, but he had cochidosias when we got him, and didn't want to put too much stress on his little puppy system). When we did it, we used Northwest Naturals, (although we were between 3 brands and Primal was one of those) we used the frozen type, and we just started one day switching. Like I bought the food on a Friday, and Saturday morning we gave it to him, monitored his poop, Sunday gave him kibble, monitored his poop and his behavior. No changes, so we went ahead with Monday with raw again, no changes, and he actually got switched pretty quickly because he didn't have any problems with switching. His poop stayed solid and consistent the whole way through, and he was switched within 2 weeks.
Bruce - Born Nov. 9th 2015, Pick up Jan. 6th 2016
At the Bridge:
Max - With us August 24th 2015 - December 16th 2015