7. Old Yeller (1957)
Let us get this straight. You introduce us to adorable Old Yeller and show young Travis becoming reluctanty attached to him, then you prove Old Yeller's awesomeness by having him save Travis and his family from a disease-infested wolf, only to have have our newly minted hero catch rabies and force the child to shoot his companion? It's a shameless attempt at conjuring tears, Disney. And we hate you because it worked so well.