The nature of dogs is that they don’t raise puppies when they are advanced in age; just like us, they want to raise their kids when they still have the energy to keep up with them. It’s not that the puppies are “obnoxious” to them, it’s just that they have another state of mind. In order to be around the older dogs, the puppy has to already have his social skills and his energy drained so they will accept him into the group. Think about kids who are raised by older parents or children visiting their grandparents. Those kids are the ones that are able to sit down in grandma’s lap and stay quiet while she reads them a book.