The idea is, of course, to get parents out of their cars and into the walking habit, while showing their dogs a good time.
There is no reason for us to mention any of this, except that it's a good excuse to retell a joke by the late, great Chic Murray. Strolling along the streets of London (as one does), he was stopped by a passer-by who asked:
"Do you know the Battersea dog's home?"
To which Chic replied: "I didn't realise he'd been away."