Chalky was TV chef Rick Stein's rough-haired Jack Russell Terrier dog, who regularly accompanied Stein when filming his popular cookery shows and became recognised and popular in his own right - many of Stein's friends and interviewees claimed he was more famous than the chef himself. The fearless, ferocious yet frequently affectionate terrier was a perfect foil to Stein's phlegmatic demeanor, and added notes of humour (frequently unintentional) to the series. Wikipedia
The definitive Wikipedia entry for Chalky. Wikipedia is the biggest multilingual free-content encyclopedia on the Internet. en.wikipedia.org/wiki/Chalky