I saw this photo in World War II Fighters by Jeffery L. Ethell & Robert T. Sand
The caption under the photo reads:
Capt. Jim Duffy greets the 354th Fighter Squadron mascot bulldog "Yank" shortly after landing at Steeple Morden in his Dragon Wagon. According to Bob Kuhnert, the well-bred English canine, whose sire was owned by Winston Churchill, was bought in a dog show in Duxford by Buck Wrightam, Harold Berg and I.C. Myers. Buck decreed he would be the squadron mascot, suggesting all personnel be called "The Bulldogs." Squadron CO Claiborne Kinnard liked the idea, put the existing unit bulldog logo in a circle and placed "The Bulldogs" across the Statue of Liberty in the background, thus creating the definative 354th Squadron patch issued to the troops. "Bulldogs" was painted above the exhaust stacks on many of the unit's P-51s. After the war Myers brought Yank home in his dufflebag. Yank was sedated before the trip to avoid alerting inspectors. They made it safely to Camp Shanks, then home to Seymour, Missouri.
Now that's a great story.