Son of Lassie

Son of Lassie is a 1945 Technicolor feature film produced by MGM based on characters created by Eric Knight, and starring Peter Lawford, Donald Crisp, June Lockhart and Pal credited as Lassie. A sequel to Lassie Come Home, the film focuses on the now adult Joe Carraclough after he joins the Royal Air Force during the World War II and is shot down over Nazioccupied Norway along with stowaway, Lassies son Laddie played by Pal. It was released theatrically on April 20, 1945, by Loews.

Laddie, being considered as a war dog, follows Joe to training school and then stows away on his masters bomber, just as it takes off on a dangerous mission over Nazioccupied Norway. The two are forced to parachute when hit by enemy fire. Laddie seeks help for his injured master and while they are separated with Joe being captured, the dog is pursued by enemy soldiers, first being sheltered by young Norwegian children and then by a freedomfighter who is killed. Laddie reaches the prisonerofwar camp where his master had been taken.The German guards use Laddie to seek out his master who had escaped. In his search for Joe who is forced into a labor detail on a coastal gun emplacement, Laddie is reunited with his master and thereafter, the two race for their lives to reach friendly lines as the Nazis pursue them. Finally free, both Joe and Laddie make their way back to the Rudling estate to reunite with Lassie, Sam Carraclough, Joes father and Priscilla June Lockhart, the Duke of Rudlings granddaughter. ........

Source: Wikipedia