I think the ProPlan Sport 26/16 is often recommended. It's an all life stages food so it can be fed to puppies as well as adults. It comes in 26/16, 28/18, and 30/20 (protein/fat) but for a family pet that's not a working or performance dog, the 26/16 is probably fine. I think some of the breeders who feed ProPlan use this, others say they use the 30/20 formula and never use puppy food. Both lab breeders that I got my dogs from said it was OK to switch from puppy to adult food between 4-6 months. Some say once the baby teeth have fallen out and adult teeth come in can be a good time to switch.
How are you and Yogi doing?