Dear all, I have a nine week old Berner puppy, and a two story house full of stairs. We have been carrying him up and down flights of stairs to go outside to potty, go upstairs to sleep, change locations with the family, etc. Needless to say, he is starting to feel quite heavy at nearly 20 lbs! (Plus, I think he enjoys the ride!) We have started teaching him to climb up the stairs. He sort of hops up them a little bit, but can make it up about 13 steps a couple of times per day. We have not worked on going down the stairs. At what age should a Berner be taught to climb up and down the stairs (w/ supervision). I am concerned about joint problems at this age. Should I be? Is it appropriate at nine weeks to start training him to do the stairs? I look forward to your feedback.