Hairy Maclary from Donaldson's Dairy (Hairy Maclary and Friends)

'Out of the gate and off for a walk went Hairy Maclary from Donaldson's Dairy...' Hairy Maclary's friends join him For a walk until, with a sudden yowl, a wail and a howl, they all run off. What could have caused such a scatter of paws?