Shelby's pups will be 4 weeks on Monday. I was hoping to start them on some rice cereal with cow's milk (is cow's milk okay?), this Sunday. They all seem to be interested in Momma's food and whenever they can, they make a beeline for her dish and start licking at the food. They don't have any teeth yet. Is it okay to start giving them solids? And how often? Shelby will still feed them for the most part, right? Thanks, I'm new to this, so every milestone for the pups is a milestone for me as well.