Descriptions from IMDB:

Lassie Come Home (1943):
“Hard times came for Carraclough family and they are forced to sell their dog to the rich Duke of Rudling. However, Lassie, the dog, is unwilling to leave the young Carraclough boy and sets out on the long and dangerous journey in order to rejoin him.”

Bingo 1991:
“Chuckie’s parents discover the stowaway pooch, and make no bones about the fact that Bingo will not accompany them on their cross-country move. What follows next is a heart warming 1000 mile adventure of puppy love and loyalty as Bingo and Chuckie encounter nutty characters and hilarious situations in thier quest to be reunited.”

Homeward Bound: The Incredible Journey 1993:
“Three pets are left behind when their family goes on vacation. Unsure of what happened, the animals set out on a quest to find their family. This journey across America is very dangerous and the animals risk never seeing their masters again.”

Lassie (2006):
“A family in financial crisis is forced to sell Lassie, their beloved dog. Hundreds of miles away from her true family, Lassie escapes and sets out on a journey home.”