What should 1 week old puppies be doing? What should my 3 week old puppy be doing? New puppy development by week is dramatic. Dr. Marty Greer, Revival’s Director of Veterinary Services has written this simple puppy growth chart to help you assess what your puppies may need, and how they are developing. Are they warm enough? Is their weight gain on-track? How soon will their eyes open? What do I need to do and watch for to make sure they’re growing the way they should? You’ll find answers to these questions and more in this puppy development stages chart, as well as feel confident that you’re helping to raise healthy puppies.