We presently have a 3 mo old female Lab/retriever cross and eventually , later this summer , would like to add a second dog to the family.(we've nearly always had 2 dogs). We will be getting a rescue dog and are considering something about a year or 2 older..young enough to still want to play but old enough to avoid having to go through that rambunctious puppy stage again (we're both seniors now). So far the reading I've done about getting a second dog involve introducing a puppy to an older dog. What about the other way around?