Bagpuss

Tamsin Drew sarcastically asked if the cat in the Eighth Doctor's TARDIS was Bagpuss. (AUDIO: Nevermore)

Information from non-valid sources
Bagpuss lived at Bagpuss & Co.. When a small boy walked into a town, Postman Pat handed him a package to deliver, which he agreed to. After entering, Bagpuss let out a yawn. (TV: Future Generations)

Other matters
Bagpuss originated from the children's television series of the same name.