Scooby snack

While he was speaking to Edward Lunn, Lunn's dog - Teazel, started barking and sniffing at the Tenth Doctor's coat pocket. Martha Jones asked "Got a Scooby snack in there?". (PROSE: Sting of the Zygons)

Behind the scenes

 * Although not mentioned in the DWU, a Scooby snack is dog treat from Scooby-Doo.