I don't wan't to worry all you puppy owning folks, but at nearly eight and a half years old, Fern
still does the wall of death, (only she no longer nips and tends not to jump on furniture
) .
She invariably charges round all the downstairs rooms, (and garden if the back door is open), at high speed with a toy in her mouth, and has perfected accurate cornering and skillful negotiation of all the furniture in her path.
She makes growly noises at me as she passes. I pretend to chase her. It's a nightly event just before feeding time, she always makes me laugh and we both love it. I hope she never grows out of it
.