Roald Dahl frequently used the name "Choccy" for his dogs in his stories. This was a nickname for "Chocolate," which is the name of the dog in his novel "Charlie and the Chocolate Factory."
However, it's important to note that Dahl also gave other dogs different names in his works. For example, in "The BFG," the giant has a dog named "The Dog".
Therefore, while "Choccy" is a common name for Dahl's dogs, it's not the only one he used.