The metal railings came through the windscreen, but missed the driver and his passenger.
Marley's owner said he was "extremely angry" about the alleged incident at Pets at Home.
Two Staffordshire bull terriers seized following the attack have been destroyed, police confirm.
Autonomous shuttles should be part of Cambridge's future transport system, a conference is told.
Its owners hope to raise £100,000 for cancer research by inviting visitors to donate.
Peterborough United strike a late equaliser to earn a point from a 2-2 draw at Shrewsbury Town.
Managerless League Two strugglers Cambridge, and Yeovil Town play out a poor rain-swept 0-0 draw at the Abbey Stadium.
About these results
Saturday Night with Justin Dealey
As BBC Radio 5 live
12 handy hacks to take the stress away
Sign up for our newsletter