"How long does it take to train a 10 year old dog to use a dog door?"
The answer is two 10 minute sessions of shoving him through head first, then encouraging him to do it for himself.
The second question arose out of our sleety horrible weather recently, because it's nice for the Little Black Dog to be able to get into the garage while we're out.
It is "How long will it take the dog to realise that he can follow the car out if he comes in through his door before the garage door goes down?"
Chance that I wasn't late for my meeting?