Kathy Callahan and Helen St. Pierre, co-authors Old Dog, New Dog: Supporting Your Aging Best Friend and Welcoming a New One talk about everything from “puppy proofing a home” to adjusting homes for senior pets to whether or not to mix it up, do you bring in a young dog to share space with an old dog?  Callahan runs a rescue for displaced senior dogs. 

Should you run with your dog? Steve offers tips.